Fix CSS formatting by adding missing closing brace and ensuring box-sizing is applied globally

Author: moses77-boop

Form-Controls/style.css

@@ -3,4 +3,8 @@
 --color-surface: #ffffff;
 --color-border: #c9c9c9;
 --radius: 8px;
+}
+
+*{
+    box-sizing: border-box;
 }