Set border-box globally instead

less/forms.less

@@ -55,7 +55,6 @@ input[type="search"],
 input[type="tel"],
 input[type="color"] {
   display: inline-block;
-  .box-sizing(border-box); // Makes inputs behave like true block-level elements
   min-height: @input-height-base; // Make inputs at least the height of their button counterpart (base line-height + padding + border)
   padding: 6px 9px;
   // margin-bottom: @line-height-base / 2;