Suppress errors. Restyle

web/static/css/style.css

@@ -373,10 +373,6 @@ input.default-width {
 }
 
 .message-input:placeholder-shown {
-    border-top: none;
-    border-left: none;
-    border-right: none;
-    border-bottom-style: dashed;
     background-color: #40444b;
     color: #fff;
 }