.selector-for-some-widget {
  box-sizing: content-box;
}

.dd-control {
    height: 37px;
    border-bottom: 2px solid #dfdfdf;
    border-top: 0px solid white;
    border-left: 0px solid white;
    border-right: 0px solid white;

}

.required {
    border-bottom: 2px solid pink;
}

.required:focus {
    border-color: red;
}