diff --git a/frontend/src/components/UserSelect.tsx b/frontend/src/components/UserSelect.tsx
index 44becae..121b7e9 100644
--- a/frontend/src/components/UserSelect.tsx
+++ b/frontend/src/components/UserSelect.tsx
@@ -166,7 +166,9 @@ const styles: Record<string, React.CSSProperties> = {
     alignItems: 'center',
     justifyContent: 'space-between',
     padding: '10px',
-    border: '1px solid #ddd',
+    borderWidth: '1px',
+    borderStyle: 'solid',
+    borderColor: '#ddd',
     borderRadius: '4px',
     backgroundColor: 'white',
     cursor: 'pointer',