Update frontend/src/App.css

frontend/src/App.css

@@ -99,8 +99,7 @@ tr:nth-child(even) {
 
 .score-fill {
   height: 100%;
-  background: #2ecc71;
-  transition: width 0.3s ease;
+  transition: width 0.3s ease, background-color 0.3s ease;
   border-radius: 12px;
 }