diff --git a/src/main/webapp/src/App.jsx b/src/main/webapp/src/App.jsx
index 04b7a97..382e70e 100644
--- a/src/main/webapp/src/App.jsx
+++ b/src/main/webapp/src/App.jsx
@@ -10,6 +10,7 @@ import {ToastContainer} from "react-toastify";
 
 import './App.css'
 import 'react-toastify/dist/ReactToastify.css';
+import {ThemeProvider} from "./hooks/useTheme.jsx";
 
 const router = createBrowserRouter([
     {
@@ -82,7 +83,9 @@ function App() {
     console.log('render')
 
     return <KeycloakContextProvider>
-        <RouterProvider router={router}/>
+        <ThemeProvider>
+            <RouterProvider router={router}/>
+        </ThemeProvider>
     </KeycloakContextProvider>;
 }
 
diff --git a/src/main/webapp/src/components/Nav.jsx b/src/main/webapp/src/components/Nav.jsx
index 3b95604..d49c009 100644
--- a/src/main/webapp/src/components/Nav.jsx
+++ b/src/main/webapp/src/components/Nav.jsx
@@ -1,38 +1,53 @@
 import LogoIcon from '../assets/FFSSAF-bord-blanc-fond-transparent.webp'
-import './Nav.css'
+// import './Nav.css'
 import {NavLink} from "react-router-dom";
 import {useAuth} from "../hooks/useAuth.jsx";
 import {login, logout} from "../utils/auth.js";
+import {ThemeCss, useTheme} from "../hooks/useTheme.jsx";
+import {FontAwesomeIcon} from "@fortawesome/react-fontawesome";
+import {faMoon, faSun} from "@fortawesome/free-regular-svg-icons";
+
+const themeSwitcherVariant = {
+    light: "outline-primary bg-light",
+    dark: "outline-light bg-dark"
+};
 
 export function Nav() {
+    const {theme} = useTheme();
 
-    return <nav className="navbar navbar-light navbar-expand-md bg-body-tertiary " id="main-navbar">
-        <div className="container-fluid">
-            <a className="navbar-brand" href="/">
-                <img className="logo" src={LogoIcon} alt="logo"/>
-                FFSAF Intra
-            </a>
+    return <>
+        <ThemeCss path="./nav"/>
+        <nav className={"navbar navbar-" + theme + " navbar-expand-md bg-body-tertiary bg-" + theme}
+             id="main-navbar">
+            <div className="container-fluid">
+                <a className="navbar-brand" href="/">
+                    <img className="logo" src={LogoIcon} alt="logo"/>
+                    FFSAF Intra
+                </a>
 
-            <button className="navbar-toggler" type="button" data-bs-toggle="collapse"
-                    data-bs-target="#navbarNavDropdown" aria-controls="navbarNavDropdown"
-                    aria-expanded="false" aria-label="Toggle navigation">
-                <span className="navbar-toggler-icon"></span>
-            </button>
-            <div className="collapse navbar-collapse" id="navbarNavDropdown">
-                <div className="collapse-item">
-                    <ul className="navbar-nav">
-                        <li className="nav-item"><NavLink className="nav-link" to="/">Accueil</NavLink></li>
-                        <AdminMenu/>
-                        <LoginMenu/>
-                    </ul>
+                <button className="navbar-toggler" type="button" data-bs-toggle="collapse"
+                        data-bs-target="#navbarNavDropdown" aria-controls="navbarNavDropdown"
+                        aria-expanded="false" aria-label="Toggle navigation">
+                    <span className="navbar-toggler-icon"></span>
+                </button>
+                <div className={"collapse navbar-collapse bg-" + theme} id="navbarNavDropdown">
+                    <div className="collapse-item">
+                        <ul className="navbar-nav">
+                            <li className="nav-item"><NavLink className="nav-link" to="/">Accueil</NavLink></li>
+                            <AdminMenu/>
+                            <LoginMenu/>
+                            <li className="nav-item"><ThemeSwitcher/></li>
+                        </ul>
+                    </div>
                 </div>
             </div>
-        </div>
-    </nav>
+        </nav>
+    </>
 }
 
 function AdminMenu() {
     const {is_authenticated, userinfo} = useAuth()
+    const {theme} = useTheme();
 
     if (!is_authenticated || !userinfo?.roles?.includes("federation_admin"))
         return <></>
@@ -41,7 +56,7 @@ function AdminMenu() {
         <div className="nav-link dropdown-toggle" role="button" data-bs-toggle="dropdown" aria-expanded="false">
             Administration
         </div>
-        <ul className="dropdown-menu">
+        <ul className={"dropdown-menu " + themeSwitcherVariant[theme]}>
             <li className="nav-item"><NavLink className="nav-link" to="/admin/member">Member</NavLink></li>
             <li className="nav-item"><NavLink className="nav-link" to="/admin/b">B</NavLink></li>
         </ul>
@@ -58,4 +73,10 @@ function LoginMenu() {
             <div className="nav-link" onClick={() => logout()}>Déconnexion</div>
         )}
     </li>
+}
+
+function ThemeSwitcher() {
+    const {isLight, toggleTheme} = useTheme()
+    return <div className="nav-link" onClick={toggleTheme}>{isLight ? <FontAwesomeIcon icon={faSun}/> :
+        <FontAwesomeIcon icon={faMoon}/>}</div>
 }
\ No newline at end of file
diff --git a/src/main/webapp/src/hooks/useTheme.jsx b/src/main/webapp/src/hooks/useTheme.jsx
new file mode 100644
index 0000000..0e9f7d3
--- /dev/null
+++ b/src/main/webapp/src/hooks/useTheme.jsx
@@ -0,0 +1,42 @@
+import React, {createContext, useContext, useLayoutEffect, useState} from "react";
+
+export const ThemeContext = createContext({
+    theme: 'light',
+    toggleTheme: () => {
+    }
+});
+
+export function useTheme() {
+    const {theme, toggleTheme} = useContext(ThemeContext);
+    return {
+        isLight: theme === 'light',
+        isDark: theme === 'dark',
+        theme,
+        toggleTheme
+    };
+}
+
+export function ThemeCss({path}) {
+    const {theme} = useTheme();
+
+    const Light = React.lazy(() => import(path + ".css"));
+    const Dark = React.lazy(() => import(path + ".dark.css"));
+
+    return <>
+        <React.Suspense fallback={<></>}>
+            {theme === "light" && <Light />}
+            {theme === "dark" && <Dark />}
+        </React.Suspense>
+    </>
+}
+
+export function ThemeProvider({children}) {
+    const [theme, setTheme] = useState('light');
+    const toggleTheme = () => {
+        setTheme(theme === 'light' ? 'dark' : 'light');
+    }
+
+    return <ThemeContext.Provider value={{theme, toggleTheme}}>
+        {children}
+    </ThemeContext.Provider>
+}
\ No newline at end of file