diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8654a1ee5..c0848215b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@
 4chan XT uses a different user script namespace, so to migrate you need to export settings from 4chan X, and import them
 in XT.
 
+### Unreleased
+
+- Also minify css in the minified build.
+
 ### XT v2.1.4 (2023-09-02)
 
 - Fix DataBoard class, should solve [#7](https://github.com/TuxedoTako/4chan-xt/issues/7)
diff --git a/tools/rollup-plugin-base64.js b/tools/rollup-plugin-base64.js
index 06175bfe7..26a169215 100644
--- a/tools/rollup-plugin-base64.js
+++ b/tools/rollup-plugin-base64.js
@@ -21,7 +21,7 @@ export default function importBase64(opts) {
       if (!filter(id)) return;
 
       const file = await readFile(id);
-      return `export default '${file.toString('base64')}';`;
+      return { code: `export default '${file.toString('base64')}';`, map: { mappings: '' } };
     }
   };
 };
diff --git a/tools/rollup-plugin-inline-file.js b/tools/rollup-plugin-inline-file.js
index 932073686..2e852d79a 100644
--- a/tools/rollup-plugin-inline-file.js
+++ b/tools/rollup-plugin-inline-file.js
@@ -1,20 +1,16 @@
 import { createFilter } from "@rollup/pluginutils";
-import { dirname } from "path";
-import { fileURLToPath } from "url";
-
-const __dirname = dirname(fileURLToPath(import.meta.url));
 
 export default async function setupFileInliner(packageJson) {
   /** @param {string} string */
   const escape = (string) => string.replace(/\\/g, '\\\\').replace(/`/g, '\\`').replace(/\$\{/g, '\\\${');
 
   /**
-   * @param {{
-   *  include: import("@rollup/pluginutils").FilterPattern,
-   *  exclude?: import("@rollup/pluginutils").FilterPattern,
-   *  transformer?: (input: string) => string
-   *  wrap?: boolean
-   * }} opts
+   * @param {Object} opts
+   * @param {import("@rollup/pluginutils").FilterPattern} opts.include
+   * @param {import("@rollup/pluginutils").FilterPattern} [opts.exclude]
+   * @param {(input: string) => string} [opts.transformer] Optional function to transform the string.
+   * @param {boolean} [opts.wrap] Wether to look for <%= meta.stuff %> and replace it, and wrap in a string,
+   *  defaults to true.
    * @returns {import("rollup").Plugin}
    */
   return function inlineFile(opts) {
@@ -38,13 +34,15 @@ export default async function setupFileInliner(packageJson) {
           if (opts.transformer) {
             code = opts.transformer(code);
           }
-          if (!wrap) return code;
+          if (wrap) {
+            code = escape(code);
+            code = code.replace(/<%= meta\.(\w+) %>/g, (match, $1) => {
+              return escape(packageJson.meta[$1]);
+            });
+            code = `export default \`${code}\`;`;
+          }
 
-          code = escape(code);
-          code = code.replace(/<%= meta\.(\w+) %>/g, (match, $1) => {
-            return escape(packageJson.meta[$1]);
-          });
-          return `export default \`${code}\`;`;
+          return { code, map: { mappings: '' } };
         }
       }
     };
diff --git a/tools/rollup.js b/tools/rollup.js
index 50355758e..44560cc87 100644
--- a/tools/rollup.js
+++ b/tools/rollup.js
@@ -39,7 +39,27 @@ const minify = process.argv.includes('-min');
     plugins: [
       typescript(),
       inlineFile({
-        include: ["**/*.html", "**/*.css"],
+        include: ["**/*.html"],
+      }),
+      inlineFile({
+        include: ["**/*.css"],
+        transformer(css) {
+          if (!minify) return css;
+
+          return css
+            // Remove whitespace after colon in css rules.
+            .replace(/^ {2,}([a-z\-]+:) +/gm, '$1')
+            // Remove newlines and trailing whitespace.
+            .replace(/\r?\n[ \t+]*/g, '')
+            // Remove last semicolon before the }.
+            .replace(/;\}/g, '}')
+            // Remove space between rule set and {.
+            .replace(/ \{/g, '{')
+            // Remove comments.
+            .replace(/\/\*[^\*]*\*\//g, '')
+            // Remove space before and after these characters in selectors.
+            .replace(/ ([>+~]) /g, '$1');
+        }
       }),
       importBase64({ include: ["**/*.png", "**/*.gif", "**/*.wav", "**/*.woff", "**/*.woff2"] }),
       inlineFile({
diff --git a/tools/tsconfig.json b/tools/tsconfig.json
index b8183e413..024702bc2 100644
--- a/tools/tsconfig.json
+++ b/tools/tsconfig.json
@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "moduleResolution": "node16",
+    "target": "ES2021",
     "types": [
       "@violentmonkey/types",
       "@types/chrome",