.subtext{
    text-decoration: none;
    display: inline-block;
  position: relative;
}
.subtext:after {    
    background: none repeat scroll 0 0 transparent;
    bottom: 0;
    content: "";
    display: block;
    height: 1px;
    position: absolute;
    background: rgb(37, 55, 156);
    transition: width 0.3s ease 0s, left 0.3s ease 0s;
    width: 0;
  }
  .subtext:hover:after { 
    width: 100%; 
    
  }