diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index f86f282..cb17589 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -6,7 +6,6 @@ import "./App.css";
 import { Main } from "./pages";
 import { Library } from "./pages/Library";
 import { Book } from "./pages/Book";
-import { primary } from "./colors";
 import { ActiveModalProps } from "./shared/components/modals/types";
 
 export const AuthContext = createContext<{
@@ -50,7 +49,6 @@ function App() {
       style={{
         height: "100vh",
         width: "100vw",
-        backgroundColor: primary,
         fontFamily: "New Amsterdam",
         overflow: "scroll",
       }}
diff --git a/frontend/src/darkmodeColors.ts b/frontend/src/darkmodeColors.ts
new file mode 100644
index 0000000..61021a2
--- /dev/null
+++ b/frontend/src/darkmodeColors.ts
@@ -0,0 +1,5 @@
+export const primary = "#5e6268";
+export const primaryRGBA = "rgba(83,86,91, 0.8)";
+export const secondary = "#5f5e68";
+export const tertiary = "#5e6768";
+export const danger = "#685e62";
diff --git a/frontend/src/index.css b/frontend/src/index.css
index 336c05e..052c22e 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -12,49 +12,208 @@ body {
   }
 }
 
-#bootstrap-overrides .form-select .form-control {
-  background-color: #f2f2e8 !important;
-  border-color: #f2f2e8 !important;
+#bootstrap-overrides {
+  background-color: #f2f3f4;
+  color: #5e6268;
+
+  .btn-primary {
+    background-color: #5e6268;
+    color: #f2f3f4;
+    border: 2px solid #5e6268;
+  }
+
+  form-control {
+    background-color: #f2f2e8 !important;
+    border-color: #5e6268 !important;
+  }
+
+  .form-select .form-control {
+    background-color: #f2f2e8 !important;
+    border-color: #f2f2e8 !important;
+  }
+
+  .dropdown-toggle::after {
+    display: none;
+  }
+
+  .form-label {
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
+      "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans",
+      "Helvetica Neue", sans-serif !important;
+    -webkit-font-smoothing: antialiased;
+    -moz-osx-font-smoothing: grayscale;
+    letter-spacing: normal;
+  }
+
+  .table > :not(caption) > * > * {
+    background-color: #f2f2e8 !important;
+    color: #5e6268 !important;
+  }
+
+  table {
+    letter-spacing: 0.25em;
+  }
+
+  .bg-primary {
+    background-color: #f2f3f4 !important;
+  }
+
+  .modal-content {
+    background-color: #f2f3f4 !important;
+    border-radius: 10px;
+  }
+
+  .modal-body {
+    background-color: #f2f3f4 !important;
+    border-radius: 0px 0px 10px 10px;
+  }
+
+  .modal-header {
+    background-color: #f2f3f4 !important;
+    border-radius: 10px 10px 0px 0px;
+    border-bottom: none;
+  }
+
+  .dropdown button {
+    background-color: #f2f2e8 !important;
+    color: #5e6268 !important;
+    border: 2px solid #5e6268;
+  }
+
+  .dropdown-menu {
+    background-color: #f2f2e8 !important;
+    color: #5e6268 !important;
+    border: 2px solid #f2f2e8;
+  }
+
+  .danger {
+    background-color: #f9a9ab !important;
+  }
+
+  .page-link {
+    color: #5e6268 !important;
+    border: 2px solid #5e6268 !important;
+    background-color: transparent !important;
+  }
+
+  .active > .page-link {
+    background-color: #5e6268 !important;
+    color: #f2f3f4 !important;
+  }
+
+  .pagination {
+    margin-top: 10px !important;
+
+    li {
+      min-width: 40px;
+    }
+  }
 }
 
-#bootstrap-overrides .dropdown-toggle::after {
-  display: none;
-}
+@media (prefers-color-scheme: dark) {
+  #bootstrap-overrides {
+    background-color: #5e6268;
+    color: #f2f3f4;
 
-#bootstrap-overrides .form-label {
-  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
-    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
-    sans-serif !important;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-  letter-spacing: normal;
-}
+    .btn-primary {
+      background-color: #f2f3f4;
+      color: #5e6268;
+      border: 2px solid #5e6268;
+    }
 
-#bootstrap-overrides table {
-  letter-spacing: 0.25em;
-}
+    .form-control {
+      background-color: #f2f2e8 !important;
+      border-color: #5e6268 !important;
+      border-right: none;
+    }
 
-#bootstrap-overrides .bg-primary {
-  background-color: #f2f3f4 !important;
-}
+    .form-select .form-control {
+      background-color: #f2f2e8 !important;
+      border-color: #f2f2e8 !important;
+    }
 
-#bootstrap-overrides .modal-body {
-  background-color: #f2f3f4 !important;
-}
+    .dropdown-toggle::after {
+      display: none;
+    }
 
-#bootstrap-overrides .danger {
-  background-color: #f9a9ab !important;
-}
+    .form-label {
+      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto",
+        "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans",
+        "Helvetica Neue", sans-serif !important;
+      -webkit-font-smoothing: antialiased;
+      -moz-osx-font-smoothing: grayscale;
+      letter-spacing: normal;
+    }
 
-#bootstrap-overrides .page-link {
-  color: black !important;
-  border: 2px solid black !important;
-  background-color: transparent !important;
-}
+    .table > :not(caption) > * > * {
+      background-color: #5e6268 !important;
+      color: #f2f2e8 !important;
+    }
 
-#bootstrap-overrides .active > .page-link {
-  background-color: black !important;
-  color: #f2f3f4 !important;
+    table {
+      letter-spacing: 0.25em;
+    }
+
+    .bg-primary {
+      background-color: #5e6268 !important;
+    }
+
+    .dropdown button {
+      background-color: #f2f2e8 !important;
+      color: #5e6268 !important;
+    }
+
+    .dropdown-menu {
+      background-color: #5e6268 !important;
+      border: 2px solid #5e6268;
+    }
+
+    .dropdown-item {
+      color: #f2f2e8 !important;
+      svg {
+        color: #f2f2e8 !important;
+      }
+    }
+    .dropdown-item:hover {
+      color: #5e6268 !important;
+      background-color: #f2f2e8 !important;
+    }
+
+    .modal-content {
+      background-color: #5e6268 !important;
+      border-radius: 10px;
+    }
+
+    .modal-body {
+      background-color: #5e6268 !important;
+      border-radius: 0px 0px 10px 10px;
+    }
+
+    .modal-header {
+      background-color: #5e6268 !important;
+      border-radius: 10px 10px 0px 0px;
+      border-bottom: none;
+    }
+
+    .danger {
+      background-color: #c94414 !important;
+    }
+
+    .page-link {
+      color: #f2f3f4 !important;
+      border: 2px solid #f2f3f4 !important;
+      background-color: transparent !important;
+    }
+
+    .active > .page-link {
+      background-color: #f2f3f4 !important;
+      color: #5e6268 !important;
+    }
+
+    .pagination {
+      margin-top: 10px !important;
+    }
+  }
 }
 
 code {
diff --git a/frontend/src/pages/Library/components/Actions.tsx b/frontend/src/pages/Library/components/Actions.tsx
index 2bc5dd4..59077ad 100644
--- a/frontend/src/pages/Library/components/Actions.tsx
+++ b/frontend/src/pages/Library/components/Actions.tsx
@@ -2,7 +2,8 @@ import { Badge, Dropdown } from "react-bootstrap";
 import { Book } from "../../../types/Book";
 import { ImBin, ImBook, ImBoxAdd, ImBoxRemove, ImMenu } from "react-icons/im";
 import { useMutation } from "@tanstack/react-query";
-import { secondary } from "../../../colors";
+import * as colors from "../../../colors";
+import * as dark from "../../../darkmodeColors";
 import { ModalContextType } from "../../../App";
 import { modalTypes } from "../../../shared/components/modals/types";
 import { useCallback } from "react";
@@ -44,11 +45,7 @@ export const Actions = ({
   return (
     <>
       <Dropdown>
-        <Dropdown.Toggle
-          variant='success'
-          id='dropdown-basic'
-          style={{ backgroundColor: secondary, border: "2px solid black" }}
-        >
+        <Dropdown.Toggle variant='success' id='dropdown-basic'>
           <ImMenu size={25} color='black' />
         </Dropdown.Toggle>
 
@@ -59,14 +56,7 @@ export const Actions = ({
               className='d-flex'
               onClick={() => setActiveModal({ type: bookModal, book, onClose })}
             >
-              <Badge
-                pill
-                className='ml-2 d-flex mr-2'
-                style={{
-                  border: "2px solid black",
-                  backgroundColor: "transparent",
-                }}
-              >
+              <Badge pill className='ml-2 d-flex mr-2'>
                 <ImBook size={25} color='black' className='m-auto' />
               </Badge>
               <p className='m-auto' style={{ paddingLeft: "10px" }}>
@@ -87,13 +77,7 @@ export const Actions = ({
                 })
               }
             >
-              <Badge
-                pill
-                className='ml-2 d-flex mr-2'
-                style={{
-                  border: "2px solid black",
-                }}
-              >
+              <Badge pill className='ml-2 d-flex mr-2'>
                 <ImBoxRemove size={25} color='black' className='m-auto' />
               </Badge>{" "}
               <p className='m-auto' style={{ paddingLeft: "10px" }}>
@@ -130,13 +114,7 @@ export const Actions = ({
                 setActiveModal({ type: del, uuid: book.uuid, onClose })
               }
             >
-              <Badge
-                pill
-                className='ml-2 d-flex danger mr-2'
-                style={{
-                  border: "2px solid black",
-                }}
-              >
+              <Badge pill className='ml-2 d-flex danger mr-2'>
                 <ImBin size={25} color='black' className='m-auto' />
               </Badge>{" "}
               <p className='m-auto' style={{ paddingLeft: "10px" }}>
diff --git a/frontend/src/pages/Main/Main.tsx b/frontend/src/pages/Main/Main.tsx
index 090b13d..a1c7197 100644
--- a/frontend/src/pages/Main/Main.tsx
+++ b/frontend/src/pages/Main/Main.tsx
@@ -13,7 +13,6 @@ import { TfiKey } from "react-icons/tfi";
 
 import { Link, useNavigate } from "react-router-dom";
 import { Book } from "../../types/Book";
-import { secondary } from "../../colors";
 import { useAuth } from "../../shared/utils/useAuthentication";
 import { ModalContext } from "../../App";
 import { modalTypes } from "../../shared/components/modals/types";
@@ -95,16 +94,12 @@ export const Main = (): React.JSX.Element => {
             onChange={(ev) => setTitle(ev.target.value)}
             style={{
               borderRadius: "20px 0px 0px 20px",
-              border: "2px solid black",
               borderRight: "none",
             }}
           />
           <Button
             style={{
               borderRadius: "0px 5px 5px 0px",
-              backgroundColor: secondary,
-              color: "black",
-              border: "2px solid black",
             }}
             className='mr-2'
             disabled={activeModal?.type === scanner || isFetching}
@@ -135,9 +130,6 @@ export const Main = (): React.JSX.Element => {
           <Button
             style={{
               borderRadius: "5px",
-              backgroundColor: secondary,
-              color: "black",
-              border: "2px solid black",
               marginLeft: "auto",
               marginRight: "10px",
             }}
@@ -151,9 +143,6 @@ export const Main = (): React.JSX.Element => {
           <Button
             style={{
               borderRadius: "5px",
-              backgroundColor: secondary,
-              color: "black",
-              border: "2px solid black",
               marginLeft: "auto",
               marginRight: "10px",
             }}
@@ -174,9 +163,6 @@ export const Main = (): React.JSX.Element => {
           <Button
             style={{
               borderRadius: "5px",
-              backgroundColor: secondary,
-              color: "black",
-              border: "2px solid black",
             }}
           >
             <ImBooks /> Browse library{" "}
@@ -186,9 +172,6 @@ export const Main = (): React.JSX.Element => {
           <Button
             style={{
               borderRadius: "5px",
-              backgroundColor: secondary,
-              color: "black",
-              border: "2px solid black",
               marginRight: "auto",
               marginLeft: "10px",
             }}
diff --git a/frontend/src/shared/components/modals/AuthenticationModal.tsx b/frontend/src/shared/components/modals/AuthenticationModal.tsx
index c5c0aa3..af3616c 100644
--- a/frontend/src/shared/components/modals/AuthenticationModal.tsx
+++ b/frontend/src/shared/components/modals/AuthenticationModal.tsx
@@ -2,7 +2,6 @@ import { useCallback, useContext } from "react";
 import { Button, Col, Form, Modal, Row } from "react-bootstrap";
 import { useForm, useWatch } from "react-hook-form";
 import { TfiKey } from "react-icons/tfi";
-import { primaryRGBA, primary, secondary } from "../../../colors";
 import { ModalHeader } from "./ModalHeader";
 import { AuthContext } from "../../../App";
 import { AuthModalProps } from "./types";
@@ -71,12 +70,7 @@ export const AuthenticationModal = ({
   );
 
   return (
-    <Modal
-      show={open}
-      onHide={onClose}
-      style={{ backgroundColor: primaryRGBA }}
-      centered
-    >
+    <Modal show={open} onHide={onClose} centered>
       <ModalHeader
         onClose={onClose}
         title={isUpdate ? "Set new Admin key" : "Admin Login"}
@@ -84,9 +78,7 @@ export const AuthenticationModal = ({
       />
       <Modal.Body
         style={{
-          border: "2px solid black",
           borderTop: "none",
-          backgroundColor: primary,
         }}
       >
         <Form
@@ -141,9 +133,6 @@ export const AuthenticationModal = ({
 
           {!isUpdate && (
             <Form.Group as={Row} className='mb-2'>
-              <Col sm='4'>
-                <Form.Label>Password</Form.Label>
-              </Col>
               <Col>
                 <Form.Control
                   {...register("password", {
@@ -166,9 +155,6 @@ export const AuthenticationModal = ({
             <Button
               style={{
                 borderRadius: "5px",
-                backgroundColor: secondary,
-                color: "black",
-                border: "2px solid black",
                 marginLeft: "auto",
                 marginRight: "10px",
               }}
diff --git a/frontend/src/shared/components/modals/BookModal.tsx b/frontend/src/shared/components/modals/BookModal.tsx
index 5c086b6..3a097ca 100644
--- a/frontend/src/shared/components/modals/BookModal.tsx
+++ b/frontend/src/shared/components/modals/BookModal.tsx
@@ -5,7 +5,6 @@ import { ModalHeader } from "./ModalHeader";
 import { useForm, useWatch } from "react-hook-form";
 import { Book, bookShelfs } from "../../../types/Book";
 import { useScanner } from "../../utils/useScanner";
-import { primary, primaryRGBA, secondary } from "../../../colors";
 import { BookModalProps } from "./types";
 
 type BookForm = Pick<Book, "isbn" | "title" | "shelf" | "published">;
@@ -94,12 +93,7 @@ export const BookModal = ({
   );
 
   return (
-    <Modal
-      show={open}
-      onHide={onClose}
-      style={{ backgroundColor: primaryRGBA }}
-      centered
-    >
+    <Modal show={open} onHide={onClose} centered>
       <ModalHeader
         onClose={onClose}
         title={`${!!book ? "Edit" : "Add new"} Book`}
@@ -107,9 +101,7 @@ export const BookModal = ({
       />
       <Modal.Body
         style={{
-          border: "2px solid black",
           borderTop: "none",
-          backgroundColor: primary,
         }}
       >
         {!showScanner && (
@@ -136,9 +128,6 @@ export const BookModal = ({
                   <Button
                     style={{
                       borderRadius: "0px 5px 5px 0px",
-                      backgroundColor: secondary,
-                      color: "black",
-                      border: "2px solid black",
                     }}
                     className='mr-2 pt-0'
                     disabled={showScanner}
@@ -237,9 +226,6 @@ export const BookModal = ({
               <Button
                 style={{
                   borderRadius: "5px",
-                  backgroundColor: secondary,
-                  color: "black",
-                  border: "2px solid black",
                   marginLeft: "auto",
                   marginRight: "10px",
                 }}
@@ -260,7 +246,6 @@ export const BookModal = ({
               className='drawingBuffer w-100 position-absolute'
               style={{
                 height: "100%",
-                border: "2px solid black",
               }}
             />
           </div>
diff --git a/frontend/src/shared/components/modals/CheckoutModal.tsx b/frontend/src/shared/components/modals/CheckoutModal.tsx
index d3eb42c..41f4077 100644
--- a/frontend/src/shared/components/modals/CheckoutModal.tsx
+++ b/frontend/src/shared/components/modals/CheckoutModal.tsx
@@ -3,7 +3,7 @@ import { Alert, Button, Col, Form, Modal, Row } from "react-bootstrap";
 import { ImBoxAdd, ImBoxRemove } from "react-icons/im";
 import { useForm, useWatch } from "react-hook-form";
 import { Book } from "../../../types/Book";
-import { primary, primaryRGBA, secondary } from "../../../colors";
+import { primary, secondary } from "../../../colors";
 import { ModalHeader } from "./ModalHeader";
 import { CheckoutBookModalProps } from "./types";
 import { AiOutlineExclamationCircle } from "react-icons/ai";
@@ -68,12 +68,7 @@ export const CheckoutBookModal = ({
   );
 
   return (
-    <Modal
-      show={open}
-      onHide={onClose}
-      style={{ backgroundColor: primaryRGBA }}
-      centered
-    >
+    <Modal show={open} onHide={onClose} centered>
       <ModalHeader
         onClose={onClose}
         title={`${isChechout ? "Checkout" : "Return"} book '${title}'`}
@@ -87,9 +82,7 @@ export const CheckoutBookModal = ({
       />
       <Modal.Body
         style={{
-          border: "2px solid black",
           borderTop: "none",
-          backgroundColor: primary,
         }}
       >
         <Alert className='w-80 m-auto my-4' variant='warning'>
@@ -187,9 +180,6 @@ export const CheckoutBookModal = ({
             <Button
               style={{
                 borderRadius: "5px",
-                backgroundColor: secondary,
-                color: "black",
-                border: "2px solid black",
                 marginLeft: "auto",
                 marginRight: "10px",
               }}
diff --git a/frontend/src/shared/components/modals/DeleteBookModal.tsx b/frontend/src/shared/components/modals/DeleteBookModal.tsx
index e352705..eada158 100644
--- a/frontend/src/shared/components/modals/DeleteBookModal.tsx
+++ b/frontend/src/shared/components/modals/DeleteBookModal.tsx
@@ -1,5 +1,5 @@
 import { Button, Modal } from "react-bootstrap";
-import { primary, primaryRGBA, secondary } from "../../../colors";
+import { primary, secondary } from "../../../colors";
 import { ModalHeader } from "./ModalHeader";
 import { ImBin } from "react-icons/im";
 import { useMutation } from "@tanstack/react-query";
@@ -24,12 +24,7 @@ export const DeleteBookModal = ({
   });
 
   return (
-    <Modal
-      show={open}
-      onHide={onClose}
-      style={{ backgroundColor: primaryRGBA }}
-      centered
-    >
+    <Modal show={open} onHide={onClose} centered>
       <ModalHeader
         onClose={onClose}
         title={"Move to Shelf"}
@@ -37,18 +32,13 @@ export const DeleteBookModal = ({
       />
       <Modal.Body
         style={{
-          border: "2px solid black",
           borderTop: "none",
-          backgroundColor: primary,
         }}
       >
         <div className='d-flex mx-auto mb-auto mt-2 w-100'>
           <Button
             style={{
               borderRadius: "5px",
-              backgroundColor: secondary,
-              color: "black",
-              border: "2px solid black",
               marginLeft: "auto",
               marginRight: "10px",
             }}
@@ -59,9 +49,6 @@ export const DeleteBookModal = ({
           <Button
             style={{
               borderRadius: "5px",
-              backgroundColor: secondary,
-              color: "black",
-              border: "2px solid black",
               marginLeft: "auto",
               marginRight: "10px",
             }}
diff --git a/frontend/src/shared/components/modals/ModalHeader.tsx b/frontend/src/shared/components/modals/ModalHeader.tsx
index 9b681d4..2338bfc 100644
--- a/frontend/src/shared/components/modals/ModalHeader.tsx
+++ b/frontend/src/shared/components/modals/ModalHeader.tsx
@@ -1,7 +1,6 @@
 import React from "react";
 import { Button, Modal } from "react-bootstrap";
 import { AiOutlineClose } from "react-icons/ai";
-import { primary, secondary } from "../../../colors";
 
 export const ModalHeader = ({
   title,
@@ -13,13 +12,7 @@ export const ModalHeader = ({
   icon?: JSX.Element;
 }): React.JSX.Element => {
   return (
-    <Modal.Header
-      style={{
-        border: "2px solid black",
-        borderBottom: "none",
-        backgroundColor: primary,
-      }}
-    >
+    <Modal.Header>
       <Modal.Title className='w-100 d-flex' style={{ height: "fit-content" }}>
         {typeof title === "string" ? (
           <>
@@ -34,9 +27,6 @@ export const ModalHeader = ({
         <Button
           className='ml-auto mr-0'
           style={{
-            backgroundColor: secondary,
-            color: "black",
-            border: "2px solid black",
             width: "fit-content",
             height: "fit-content",
           }}
diff --git a/frontend/src/shared/components/modals/ScannerModal.tsx b/frontend/src/shared/components/modals/ScannerModal.tsx
index a5bdd25..488ee0b 100644
--- a/frontend/src/shared/components/modals/ScannerModal.tsx
+++ b/frontend/src/shared/components/modals/ScannerModal.tsx
@@ -1,7 +1,6 @@
-import React from "react";
+import React, { useContext } from "react";
 import { Modal } from "react-bootstrap";
 import { ImCamera } from "react-icons/im";
-import { primaryRGBA } from "../../../colors";
 import { useScanner } from "../../utils/useScanner";
 import { ModalHeader } from "./ModalHeader";
 
@@ -17,18 +16,13 @@ export const ScannerModal = ({
   const { scannerError, setScannerRef } = useScanner({ onDetected });
 
   return (
-    <Modal
-      show={open}
-      onHide={onClose}
-      style={{ backgroundColor: primaryRGBA }}
-      centered
-    >
+    <Modal show={open} onHide={onClose} centered>
       <ModalHeader
         onClose={onClose}
         title={"Scan barcode"}
         icon={<ImCamera size={50} className='ml-0 mr-auto' />}
       />
-      <Modal.Body style={{ border: "2px solid black", borderTop: "none" }}>
+      <Modal.Body>
         <div
           className='w-100 overflow-hidden'
           ref={(ref) => setScannerRef(ref)}
@@ -41,7 +35,7 @@ export const ScannerModal = ({
             className='drawingBuffer w-100 position-absolute'
             style={{
               height: "100%",
-              border: "2px solid black",
+              border: `2px solid black`,
             }}
           />
         </div>