fix dropdown buttons not taking full width

core/css/buttons.css

@@ -256,8 +256,8 @@ button.formbutton a {
 
 *.wdropdown > div.select > button {
 	cursor: pointer;
-	margin: 4px;
 	text-align: left;
+	width: 100%;
 }
 
 .wbtngroup { display: inline-block; }