.wp-block-heading{border-bottom:.01em solid #e3e3e3;position:relative;width:100%}.wp-block-heading:after{background:#555;bottom:0;content:"";height:3px;left:0;position:absolute;transform:scaleX(0);transform-origin:left top;transition:.5s;width:50%}.wp-block-heading:active:after,.wp-block-heading:focus:after,.wp-block-heading:hover:after{transform:scale(1)}