.btn-cont
  %a.btn{ :href => "#"}
    Learn More
    %span.line-1
    %span.line-2
    %span.line-3
    %span.line-4

@import "bourbon";

body {
  height: 100%;
  width: 100%;
  background-color: black;
}

.btn-cont {
  text-align: center;
  margin-top: 200px;
  
  .btn {
    position: relative;
    padding: 20px 70px;
    border: 1px solid white;
    color: white;
    text-decoration: none;
    font-size: em(18px);
    font-family: 'Open Sans', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
    -webkit-font-smoothing: antialiased;
    
    &:hover {
      border: none;
      
      .line-1 {
        animation: move1 1500ms infinite ease;
      }
      
      .line-2 {
        animation: move2 1500ms infinite ease;
      }
      
      .line-3 {
        animation: move3 1500ms infinite ease;
      }
      
      .line-4 {
        animation: move4 1500ms infinite ease;
      }
    }
  }
  
  .line-1 {
    content: "";
    display: block;
    position: absolute;
    width: 1px;
    background-color: white;
    left: 0;
    bottom: 0;
  }
  .line-2 {
    content: "";
    display: block;
    position: absolute;
    height: 1px;
    background-color: white;
    left: 0;
    top: 0;
  }
  .line-3 {
    content: "";
    display: block;
    position: absolute;
    width: 1px;
    background-color: white;
    right: 0;
    top: 0;
  }
  .line-4 {
    content: "";
    display: block;
    position: absolute;
    height: 1px;
    background-color: white;
    right: 0;
    bottom: 0;
  }
}

@keyframes move1 {
  0% {
    height: 100%; 
    bottom: 0;
  }
  54% {
    height: 0; 
    bottom: 100%;
  }
  55% {
    height: 0; 
    bottom: 0;
  }
  100% {
    height: 100%; 
    bottom: 0;
  }
}

@keyframes move2 {
  0% {
    width: 0;
    left: 0;
  }
  50% {
    width: 100%; 
    left: 0;
  }
  100% {
    width: 0; 
    left: 100%;
  }
}

@keyframes move3 {
  0% {
    height: 100%; 
    top: 0;
  }
  54% {
    height: 0; 
    top: 100%;
  }
  55% {
    height: 0; 
    top: 0;
  }
  100% {
    height: 100%; 
    top: 0;
  }
}

@keyframes move4 {
  0% {
    width: 0; 
    right: 0;
  }
  55% {
    width: 100%; 
    right: 0;
  }
  100% {
    width: 0; 
    right: 100%;
  }
}