<a href="#" class="btn">Click Click Click!</a>
// reset & normalize
* {
  text-decoration: none;
}

html {
  font-size: 62.5%; // 62.5% = 1rem = 10px
  padding: 3rem;
  color: #614f38;
}

body {
  font-size: 1.6rem;
}

// Start!
a.btn {
  position: relative;
  display: inline-block;
  border-bottom: 2px dotted;
  padding: .5rem 2.6rem .5rem .5rem;
  transition: all .3s;
  color:#614f38;

  &:before {
    content: "";
    position: absolute;
    right: 5px;
    bottom: 0;
    width: 0;
    height: 0;
    bottom:40%;
    border-left: 5px solid black;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    transition: all .3s;
    
  }
  &:hover{
    
    &:before{
      right:0;
    }
  }
}
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