diff --git a/.vite/pack-extension.js b/.vite/pack-extension.js
index d264e9f..a5cf79d 100644
--- a/.vite/pack-extension.js
+++ b/.vite/pack-extension.js
@@ -67,13 +67,24 @@ export async function packExtension(settings) {
     return entry;
   })
 
-  if (process.env.SITE === 'derpibooru') {
-    manifest.replaceHostTo([
-      'derpibooru.org',
-      'trixiebooru.org'
-    ]);
-    manifest.replaceBooruNameWith('Derpibooru');
-    manifest.setGeckoIdentifier('derpibooru-tagging-assistant@thecore.city');
+  switch (process.env.SITE) {
+    case 'derpibooru':
+      manifest.replaceHostTo([
+        'derpibooru.org',
+        'trixiebooru.org'
+      ]);
+      manifest.replaceBooruNameWith('Derpibooru');
+      manifest.setGeckoIdentifier('derpibooru-tagging-assistant@thecore.city');
+      break;
+
+    case 'tantabus':
+      manifest.replaceHostTo('tantabus.ai');
+      manifest.replaceBooruNameWith('Tantabus');
+      manifest.setGeckoIdentifier('tantabus-tagging-assistant@thecore.city');
+      break;
+
+    default:
+      console.warn('No replacement set up for site: ' + process.env.SITE);
   }
 
   manifest.passVersionFromPackage(path.resolve(settings.rootDir, 'package.json'));
diff --git a/package.json b/package.json
index 9263983..c8d50df 100644
--- a/package.json
+++ b/package.json
@@ -5,6 +5,7 @@
     "scripts": {
         "build": "npm run build:popup && npm run build:extension",
         "build:derpibooru": "cross-env SITE=derpibooru npm run build",
+        "build:tantabus": "cross-env SITE=tantabus npm run build",
         "build:popup": "vite build",
         "build:extension": "node build-extension.js",
         "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
diff --git a/src/routes/about/+page.svelte b/src/routes/about/+page.svelte
index 525d24f..b56fcfd 100644
--- a/src/routes/about/+page.svelte
+++ b/src/routes/about/+page.svelte
@@ -11,6 +11,10 @@
   if (__CURRENT_SITE__ === 'derpibooru') {
     currentSiteUrl = 'https://derpibooru.org';
   }
+
+  if (__CURRENT_SITE__ === 'tantabus') {
+    currentSiteUrl = 'https://tantabus.ai';
+  }
 </script>
 
 <Menu>
diff --git a/src/styles/colors.scss b/src/styles/colors.scss
index 40e72bb..504933a 100644
--- a/src/styles/colors.scss
+++ b/src/styles/colors.scss
@@ -95,3 +95,31 @@ $warning-border: #95562c;
   $input-background: #282e39;
   $input-border: #575e6b;
 }
+
+@if environment.$current-site == 'tantabus' {
+  $background: #221117;
+
+  $text: #e0e0e0;
+  $text-gray: #bb90a6;
+
+  $link: #ee157a;
+  $link-hover: #b099dd;
+
+  $header: #811242;
+  $header-toolbar: #501e36;
+  $header-hover-background: #5d0d30;
+  $header-mobile-link-hover: #995470;
+
+  $footer: #2f1d26;
+  $footer-text: $text-gray;
+
+  $block-header: $header-toolbar;
+  $block-border: $header-toolbar;
+  $block-background: #2f1d26;
+  $block-background-alternate: #26171e;
+
+  $media-box-border: #573142;
+
+  $input-background: #392833;
+  $input-border: #6b5764;
+}
diff --git a/src/styles/injectable/tag.scss b/src/styles/injectable/tag.scss
index db105d4..8643967 100644
--- a/src/styles/injectable/tag.scss
+++ b/src/styles/injectable/tag.scss
@@ -9,7 +9,7 @@
   padding: 0 4px;
   display: flex;
 
-  @if environment.$current-site == 'derpibooru' {
+  @if environment.$current-site == 'derpibooru' or environment.$current-site == 'tantabus' {
     border: 1px solid colors.$tag-border;
     line-height: 24px;
   }
diff --git a/vite.config.ts b/vite.config.ts
index b6d5b66..530213a 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -20,6 +20,14 @@ export default defineConfig(() => {
           __CURRENT_SITE_NAME__: JSON.stringify('Derpibooru'),
         }
       }),
+      SwapDefinedVariablesPlugin({
+        envVariable: 'SITE',
+        expectedValue: 'tantabus',
+        define: {
+          __CURRENT_SITE__: JSON.stringify('tantabus'),
+          __CURRENT_SITE_NAME__: JSON.stringify('Tantabus'),
+        }
+      }),
     ],
     test: {
       globals: true,