diff --git a/public/css/admin.css b/public/css/admin.css
index e69e854..f0b7503 100644
--- a/public/css/admin.css
+++ b/public/css/admin.css
@@ -4,18 +4,20 @@
 	position: relative;
 }
 .polaroid a.edit {
-	background: #fff;
+	background: var(--bs-body-bg);
 	border-radius: 3px;
 	box-shadow: 1px 1px 2px rgba(0,0,0,0.3);
-	display: none !important;
+	color: var(--bs-body-color);
+	opacity: 0;
 	left: 20px;
 	line-height: 1.5;
 	padding: 5px 10px;
 	position: absolute;
+	transition: 0.25s;
 	top: 20px;
 }
 .polaroid:hover > a.edit {
-	display: block !important;
+	opacity: 1;
 }
 
 
diff --git a/public/css/default.css b/public/css/default.css
index 717388a..fc7d8f7 100644
--- a/public/css/default.css
+++ b/public/css/default.css
@@ -18,6 +18,11 @@ body {
 	font-family: "Open Sans", sans-serif;
 	background: #aaa 0 -50% fixed;
 	padding: 0 0 3rem;
+    transition: 0.5s;
+}
+
+[data-bs-theme=dark] body {
+    background-color: #444;
 }
 
 #wrapper, header .container {
@@ -34,6 +39,14 @@ a:hover {
 	color: #262626;
 }
 
+[data-bs-theme=dark] .content-box a:not(.btn) {
+    color: #b94b4b;
+}
+[data-bs-theme=dark] .content-box a:not(.btn):hover {
+    color: #963626;
+}
+
+
 .page-link {
 	color: #b50707;
 	font-family: 'Coda', sans-serif;
@@ -182,7 +195,7 @@ i.nyan-cat {
 /* Content boxes
 ------------------*/
 .content-box {
-	background-color: #fff;
+	background-color: var(--bs-body-bg);
 	margin: 0 auto 2rem;
 	padding: 2rem;
 	border-radius: 0.5rem;
@@ -203,10 +216,10 @@ i.nyan-cat {
 }
 
 .tiled-header > a {
-	background: #fff;
+	background: var(--bs-body-bg);
 	box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
 	border-radius: 0.5rem;
-	color: #000;
+	color: var(--bs-body-color);
 	display: inline-block;
 	font: 400 18px/2.2 'Coda', sans-serif;
 	margin: 0 0 1.5% 0;
@@ -217,7 +230,7 @@ i.nyan-cat {
 }
 
 div.polaroid {
-	background: #fff;
+	background: var(--bs-body-bg);
 	box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.3);
 	line-height: 0;
 	position: relative;
@@ -227,7 +240,7 @@ div.polaroid:hover {
 	box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.5);
 }
 div.polaroid img.normal-photo {
-	background: #fff url('../images/nothumb.svg') center no-repeat;
+	background: var(--bs-body-bg) url('../images/nothumb.svg') center no-repeat;
 	border: none;
 	left: 0;
 	object-fit: cover;
@@ -246,13 +259,13 @@ div.polaroid img.blur-photo {
 	z-index: 0;
 }
 div.polaroid img.placeholder-image {
-	background: #fff;
+	background: var(--bs-body-bg);
 	z-index: 20;
 }
 div.polaroid h4 {
-	background: #fff;
+	background: var(--bs-body-bg);
 	bottom: 0;
-	color: #000;
+	color: var(--bs-body-color);
 	margin: 0;
 	font: 400 18px 'Coda', sans-serif;
 	padding: 15px 5px;
@@ -278,7 +291,7 @@ div.polaroid a {
 	width: 100%;
 }
 .album_title_box > a {
-	background: #fff;
+	background: var(--bs-body-bg);
 	box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
 	border-top-left-radius: 0.5rem;
 	border-bottom-left-radius: 0.5rem;
@@ -289,7 +302,7 @@ div.polaroid a {
 	padding: 8px 10px;
 }
 .album_title_box > div {
-	background: #fff;
+	background: var(--bs-body-bg);
 	box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
 	border-top-right-radius: 0.5rem;
 	border-bottom-right-radius: 0.5rem;
@@ -300,7 +313,7 @@ div.polaroid a {
 	margin: 0 0 1.5% 0;
 }
 .album_title_box h2 {
-	color: #262626;
+	color: var(--bs-body-color);
 	font: 400 18px/2 'Coda', sans-serif !important;
 	margin: 0;
 }
@@ -316,10 +329,18 @@ div.polaroid a {
 	margin-bottom: 3rem;
 }
 .album_button_box > a {
+	background: var(--bs-body-bg);
 	box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
+	border-color: var( --bs-secondary-bg);
+	color: var(--bs-body-color);
 	padding: 8px 10px;
 	margin-left: 12px;
 }
+.album_button_box > a:hover {
+	background: var(--bs-secondary-bg);
+	border-color: var(--bs-tertiary-bg);
+	color: var(--bs-secondary-color);
+}
 
 
 /* (Tag) autosuggest
@@ -329,8 +350,9 @@ div.polaroid a {
 	position: relative;
 }
 .autosuggest {
-	background: #fff;
+	background: var(--bs-body-bg);
 	border: 1px solid #ccc;
+	color: var(--bs-body-color);
 	position: absolute;
 	left: 2px;
 	top: 37px;
@@ -459,9 +481,9 @@ figure#photo-figure img.blur-photo {
 }
 
 #previous_photo, #next_photo {
-	background: #fff;
+	background: var(--bs-body-bg);
 	box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
-	color: #262626;
+	color: var(--bs-body-color);
 	font-size: 3rem;
 	line-height: 0.5;
 	padding: 2rem 0.5rem;
@@ -473,8 +495,8 @@ span#previous_photo, span#next_photo {
 	opacity: 0.25;
 }
 a#previous_photo:hover, a#next_photo:hover {
-	background: #eee;
-	color: #000;
+	background: var(--bs-secondary-bg);
+	color: var(--bs-secondary-color);
 }
 #previous_photo {
 	border-top-right-radius: 0.5rem;
diff --git a/public/js/color-modes.js b/public/js/color-modes.js
new file mode 100644
index 0000000..b916780
--- /dev/null
+++ b/public/js/color-modes.js
@@ -0,0 +1,77 @@
+/*!
+ * Color mode toggler for Bootstrap's docs (https://getbootstrap.com/)
+ * Copyright 2011-2023 The Bootstrap Authors
+ * Licensed under the Creative Commons Attribution 3.0 Unported License.
+ */
+
+(() => {
+	'use strict'
+
+	const getStoredTheme = () => localStorage.getItem('theme');
+	const setStoredTheme = theme => localStorage.setItem('theme', theme);
+
+	const getPreferredTheme = () => {
+		const storedTheme = getStoredTheme();
+		if (storedTheme) {
+			return storedTheme;
+		}
+
+		return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+	}
+
+	const setTheme = theme => {
+		if (theme === 'auto' && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+			document.documentElement.setAttribute('data-bs-theme', 'dark');
+		} else {
+			document.documentElement.setAttribute('data-bs-theme', theme);
+		}
+	}
+
+	setTheme(getPreferredTheme());
+
+	const showActiveTheme = (theme, focus = false) => {
+		const themeSwitcher = document.querySelector('#bd-theme');
+
+		if (!themeSwitcher) {
+			return;
+		}
+
+		const themeSwitcherText = document.querySelector('#bd-theme-text');
+		const activeThemeIcon = document.querySelector('#theme-icon-active');
+		const btnToActive = document.querySelector(`[data-bs-theme-value="${theme}"]`);
+		const activeButtonIcon = btnToActive.querySelector('i.bi').className;
+
+		document.querySelectorAll('[data-bs-theme-value]').forEach(element => {
+			element.classList.remove('active');
+		});
+
+		btnToActive.classList.add('active');
+		activeThemeIcon.className = activeButtonIcon;
+		const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`
+
+		if (focus) {
+			themeSwitcher.focus()
+		}
+	}
+
+	window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => {
+		const storedTheme = getStoredTheme()
+		if (storedTheme !== 'light' && storedTheme !== 'dark') {
+			setTheme(getPreferredTheme())
+		}
+	})
+
+	window.addEventListener('DOMContentLoaded', () => {
+		showActiveTheme(getPreferredTheme())
+
+		document.querySelectorAll('[data-bs-theme-value]')
+			.forEach(toggle => {
+				toggle.addEventListener('click', () => {
+					const theme = toggle.getAttribute('data-bs-theme-value')
+					setStoredTheme(theme)
+					setTheme(theme)
+					showActiveTheme(theme, true)
+				})
+			})
+	})
+})()
diff --git a/templates/MainNavBar.php b/templates/MainNavBar.php
index 1616057..51ae4c1 100644
--- a/templates/MainNavBar.php
+++ b/templates/MainNavBar.php
@@ -51,6 +51,8 @@ class MainNavBar extends NavBar
 			$userMenu = new UserMenu();
 			$this->renderMenuItems($userMenu->getItems());
 
+			$this->darkModeToggle();
+
 			echo '
 					</ul>
 				</div>';
@@ -60,4 +62,36 @@ class MainNavBar extends NavBar
 			</div>
 		</nav>';
 	}
+
+	private function darkModeToggle()
+	{
+		echo '
+						<li class="nav-item dropdown">
+							<button class="btn btn-link nav-link py-2 px-0 px-lg-2 dropdown-toggle d-flex align-items-center"
+								id="bd-theme" type="button" data-bs-toggle="dropdown" data-bs-display="static">
+								<i id="theme-icon-active" class="bi bi-light"></i>
+								<span class="d-lg-none ms-2" id="bd-theme-text">Toggle theme</span>
+							</button>
+							<ul class="dropdown-menu dropdown-menu-end">
+								<li>
+									<button type="button" class="dropdown-item d-flex align-items-center" data-bs-theme-value="light">
+										<i class="bi bi-sun-fill"></i>
+										Light
+									</button>
+								</li>
+								<li>
+									<button type="button" class="dropdown-item d-flex align-items-center" data-bs-theme-value="dark">
+										<i class="bi bi-moon-stars-fill"></i>
+										Dark
+									</button>
+								</li>
+								<li>
+									<button type="button" class="dropdown-item d-flex align-items-center active" data-bs-theme-value="auto">
+										<i class="bi bi-circle-half"></i>
+										Auto
+									</button>
+								</li>
+							</ul>
+						</li>';
+	}
 }
diff --git a/templates/MainTemplate.php b/templates/MainTemplate.php
index 8c8a92f..413c5c4 100644
--- a/templates/MainTemplate.php
+++ b/templates/MainTemplate.php
@@ -39,7 +39,8 @@ class MainTemplate extends Template
 		<link rel="stylesheet" href="', BASEURL, '/vendor/twbs/bootstrap/dist/css/bootstrap.min.css">
 		<link rel="stylesheet" href="', BASEURL, '/vendor/twbs/bootstrap-icons/font/bootstrap-icons.css">
 		<link type="text/css" rel="stylesheet" href="', BASEURL, '/css/default.css">
-		<script type="text/javascript" src="', BASEURL, '/js/main.js"></script>'
+		<script type="text/javascript" src="', BASEURL, '/js/main.js"></script>
+		<script type="text/javascript" src="', BASEURL, '/js/color-modes.js"></script>'
 		, $this->header_html, '
 	</head>
 	<body', !empty($this->classes) ? ' class="' . implode(' ', $this->classes) . '"' : '', '>