diff --git a/src/vite-config.js b/src/vite-config.js
index 378abbb..c477e03 100644
--- a/src/vite-config.js
+++ b/src/vite-config.js
@@ -35,6 +35,36 @@ const normalizeScssManifestEntries = (outDir) => {
   }
 };
 
+const normalizeCssAssetUrls = (outDir) => {
+  walkFiles(outDir, (absolutePath) => {
+    if (!absolutePath.endsWith('.css')) {
+      return;
+    }
+
+    const cssDir = normalizePath(relative(outDir, dirname(absolutePath)));
+    if (!cssDir || cssDir === '.') {
+      return;
+    }
+
+    const sameDirectoryAssetPrefix = `../${cssDir}/`;
+    const contents = readFileSync(absolutePath, 'utf8');
+    const normalized = contents.replace(
+      /url\((['"]?)(?!data:|https?:|\/\/|\/)([^'")]+)\1\)/g,
+      (match, quote, assetUrl) => {
+        if (!assetUrl.startsWith(sameDirectoryAssetPrefix)) {
+          return match;
+        }
+
+        return `url(${quote}${assetUrl.slice(sameDirectoryAssetPrefix.length)}${quote})`;
+      }
+    );
+
+    if (normalized !== contents) {
+      writeFileSync(absolutePath, normalized);
+    }
+  });
+};
+
 const copyServerFilesPlugin = ({ sourceDir, outDir }) => ({
   name: 'copy-bridgeable-server-files',
   buildStart() {
@@ -59,6 +89,7 @@ const copyServerFilesPlugin = ({ sourceDir, outDir }) => ({
     });
 
     normalizeScssManifestEntries(outDir);
+    normalizeCssAssetUrls(outDir);
   }
 });