.border-button {
    text-align: center;
  text-decoration: none;
  display: inline-block;
  padding: 20px 30px;
  margin: 10px 20px;
  position: relative;
  color: white;
  border: 1px solid rgba(255, 255, 255, .4);
  background: none;
  font-weight: 300;
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  letter-spacing: 2px;
}
.border-button:before, .border-button:after {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  box-sizing: border-box;
}
.border-button:before {
  bottom: 0;
  left: 0;
  border-left: 1px solid white;
  border-top: 1px solid white;
  transition: 0s ease opacity .8s, .2s ease width .4s, .2s ease height .6s;
}
.border-button:after {
  top: 0;
  right: 0;
  border-right: 1px solid white;
  border-bottom: 1px solid white;
  transition: 0s ease opacity .4s, .2s ease width, .2s ease height .2s;
}
.border-button:hover:before, 
.border-button:hover:after {
  height: 100%;
  width: 100%;
  opacity: 1;
}
.border-button:hover:before {
  transition: 0s ease opacity 0s, .2s ease height, .2s ease width .2s;
}
.border-button:hover:after {
  transition: 0s ease opacity .4s, .2s ease height .4s, .2s ease width .6s;
}
.border-button:hover {
  background: rgba(255, 255, 255, .2);
}