<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!
.btn {
  display: inline-block;
  border: 1px solid;
  position: relative;
  background: #fff;
  color:#614f38;
  border:2px solid #614f38;
  padding:1.5rem 5.5rem 1.5rem 1.8rem;
  transition: all .3s;

  &:after{
    content:"";
    position:absolute;
    display: block;
    transition: all .3s;
    width: 7px;
    height: 18px;
    top:50%;
    right: 2.5rem;
    box-shadow:2px -2px 0 #fff;
    border-top: solid 2px #614f38;
    border-right: solid 2px #614f38;
    transform: translateY(-50%) rotate(45deg) skewX(-45deg);;
    
  }

  &:hover {
    &:after {
      right:5px;
      height: 40px;
    }
  }
}
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