Update app.py

app.py

@@ -109,11 +109,11 @@ css = '''
   border-radius: 10px;
   padding: 10px;
   margin-top: 10px;
-  background-color: pink;
+  background: pink;
 }
 .bubble > textarea{
   border: none;
-  background-color: pink;
+  background: pink;
 }
 
 '''