Minor style improvements

src/styles.scss

@@ -121,11 +121,11 @@ div.col-sm-8 {
 
 .btn-disabled {
 	color: #AAA !important;
-	background-color: #CCC !important;
+	background-color: unset;
 	border-color: #CCC !important;;
 	cursor: not-allowed !important;
 	&:hover {
-		background-color: #CCC !important;;
+		background-color: unset;
 	}
 }