.button {
    float: left;
    text-align: center;
    width: 140px;
    padding: 28px 0;
    position: relative;
    margin: 0 15px;
}

.o-button {
    position: relative;
}
.button:hover, .o-button:hover {
    cursor: pointer;
}
.button:after {
    bottom: 20px;
}
.o-button:after {
    bottom: 0;
}

.button:after, .o-button:after {    
  background: none repeat scroll 0 0 transparent;
  content: "";
  display: block;
  height: 2px;
  left: 50%;
  position: absolute;
  background: #fff;
  transition: width 0.3s ease 0s, left 0.3s ease 0s;
  width: 0;
}
.button:hover:after, .o-button:hover:after { 
  width: 100%; 
  l