diff --git a/biome.json b/biome.json
index 2ae842d58..02caffa10 100644
--- a/biome.json
+++ b/biome.json
@@ -17,6 +17,15 @@
       }
     }
   },
+  "css": {
+    "formatter": {
+      "enabled": true,
+      "indentStyle": "space",
+      "indentWidth": 2,
+      "lineWidth": 100,
+      "quoteStyle": "single"
+    }
+  },
   "javascript": {
     "formatter": {
       "quoteStyle": "single"
diff --git a/sample/create-react-app-5/src/Sample.css b/sample/create-react-app-5/src/Sample.css
index fcd6c299b..7681695f5 100644
--- a/sample/create-react-app-5/src/Sample.css
+++ b/sample/create-react-app-5/src/Sample.css
@@ -1,10 +1,7 @@
 body {
   margin: 0;
   background-color: #525659;
-  font-family:
-    Segoe UI,
-    Tahoma,
-    sans-serif;
+  font-family: Segoe UI, Tahoma, sans-serif;
 }
 
 .Example input,
diff --git a/sample/next-app/app/Sample.css b/sample/next-app/app/Sample.css
index fcd6c299b..7681695f5 100644
--- a/sample/next-app/app/Sample.css
+++ b/sample/next-app/app/Sample.css
@@ -1,10 +1,7 @@
 body {
   margin: 0;
   background-color: #525659;
-  font-family:
-    Segoe UI,
-    Tahoma,
-    sans-serif;
+  font-family: Segoe UI, Tahoma, sans-serif;
 }
 
 .Example input,
diff --git a/sample/next-pages/pages/Sample.css b/sample/next-pages/pages/Sample.css
index fcd6c299b..7681695f5 100644
--- a/sample/next-pages/pages/Sample.css
+++ b/sample/next-pages/pages/Sample.css
@@ -1,10 +1,7 @@
 body {
   margin: 0;
   background-color: #525659;
-  font-family:
-    Segoe UI,
-    Tahoma,
-    sans-serif;
+  font-family: Segoe UI, Tahoma, sans-serif;
 }
 
 .Example input,
diff --git a/sample/parcel2/Sample.css b/sample/parcel2/Sample.css
index fcd6c299b..7681695f5 100644
--- a/sample/parcel2/Sample.css
+++ b/sample/parcel2/Sample.css
@@ -1,10 +1,7 @@
 body {
   margin: 0;
   background-color: #525659;
-  font-family:
-    Segoe UI,
-    Tahoma,
-    sans-serif;
+  font-family: Segoe UI, Tahoma, sans-serif;
 }
 
 .Example input,
diff --git a/sample/vite/Sample.css b/sample/vite/Sample.css
index fcd6c299b..7681695f5 100644
--- a/sample/vite/Sample.css
+++ b/sample/vite/Sample.css
@@ -1,10 +1,7 @@
 body {
   margin: 0;
   background-color: #525659;
-  font-family:
-    Segoe UI,
-    Tahoma,
-    sans-serif;
+  font-family: Segoe UI, Tahoma, sans-serif;
 }
 
 .Example input,
diff --git a/sample/webpack5/Sample.css b/sample/webpack5/Sample.css
index fcd6c299b..7681695f5 100644
--- a/sample/webpack5/Sample.css
+++ b/sample/webpack5/Sample.css
@@ -1,10 +1,7 @@
 body {
   margin: 0;
   background-color: #525659;
-  font-family:
-    Segoe UI,
-    Tahoma,
-    sans-serif;
+  font-family: Segoe UI, Tahoma, sans-serif;
 }
 
 .Example input,
diff --git a/test/Test.css b/test/Test.css
index 895efbb8f..ba4af3037 100644
--- a/test/Test.css
+++ b/test/Test.css
@@ -1,9 +1,6 @@
 body {
   margin: 0;
-  font-family:
-    Segoe UI,
-    Tahoma,
-    sans-serif;
+  font-family: Segoe UI, Tahoma, sans-serif;
 }
 
 .Test header {