SOURCE

<div>
  <button class="btn-more">Learn More</button>
</div>

body{
  background:#000;
}
div{
  text-align:center;
  margin-top:100px;
}
.btn-more{
  position:relative;
    width: 160px;
    padding: 10px 0;
    transition: all 0.15s ease-in;
    border: none;
    background: rgba(255, 255, 255, 0.7);
    color: #333;
    font-size: 18px;
    outline: none;
    cursor: pointer;
}
.btn-more:after {
    transition: all 0.15s ease-in;
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    content: ' ';
    opacity: 0;
    border: 1px solid #fff;
}
.btn-more:hover {
    background: rgba(255, 255, 255, 0);
    color: #fff;
}
.btn-more:hover:after {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 1;
}