diff --git a/client/simple/vite.config.js b/client/simple/vite.config.js
index f389e9ffe..b2d409db9 100644
--- a/client/simple/vite.config.js
+++ b/client/simple/vite.config.js
@@ -48,45 +48,20 @@ export default defineConfig({
   // - build.sourcemap
   // - esbuild.sourcemap
   // - css.preprocessorOptions.less.sourceMap
-
   css: {
-    devSourcemap: true,
-    preprocessorOptions: {
-      less: {
-        // FIXME: missing CCS sourcemaps!!
-        sourceMap: {
-          outputSourceFiles: true,
-          sourceMapURL: (name) => {
-            const s = name.split("/");
-            return `${s[s.length - 1]}.map`;
-          }
-        }
-        // env: 'development',
-        // relativeUrls: true,
-        // javascriptEnabled: true,
-      }
-    }
+    devSourcemap: true
   }, // end: css
 
-  esbuild: {
-    // FIXME: missing CCS sourcemaps!!
-    sourcemap: true
-  },
-
   build: {
-    target: "modules",
+    target: ["chrome87", "edge88", "firefox78", "safari14"],
     manifest: "manifest.json",
     emptyOutDir: true,
     assetsDir: "",
     outDir: PATH.dist,
 
-    // FIXME: missing CCS sourcemaps!!
     sourcemap: true,
-
-    // https://vite.dev/config/build-options.html#build-cssminify
-    cssMinify: true,
-    // cssMinify: "esbuild",
     minify: "esbuild",
+    cssMinify: "esbuild",
 
     rollupOptions: {
       input: {
diff --git a/searx/static/themes/simple/manifest.json b/searx/static/themes/simple/manifest.json
index 19655e56a..44fb9600f 100644
--- a/searx/static/themes/simple/manifest.json
+++ b/searx/static/themes/simple/manifest.json
@@ -14,16 +14,25 @@
   "less/rss.less": {
     "file": "css/rss.min.css",
     "src": "less/rss.less",
-    "isEntry": true
+    "isEntry": true,
+    "names": [
+      "css/rss.min.css"
+    ]
   },
   "less/style-ltr.less": {
     "file": "css/searxng.min.css",
     "src": "less/style-ltr.less",
-    "isEntry": true
+    "isEntry": true,
+    "names": [
+      "css/searxng.min.css"
+    ]
   },
   "less/style-rtl.less": {
     "file": "css/searxng-rtl.min.css",
     "src": "less/style-rtl.less",
-    "isEntry": true
+    "isEntry": true,
+    "names": [
+      "css/searxng-rtl.min.css"
+    ]
   }
 }
\ No newline at end of file