<div class="button-wrapper">
  <div class="button">CLICK</div>
</div>

@import url('https://fonts.googleapis.com/css?family=Roboto+Mono:300,400,500');

html,body {
  margin: 0;
  padding: 0;
}
body {
  background-color: rgba(255,209,57,0.5);
}
.button-wrapper {
  position: absolute;
  width: 120px;
  height: 40px;
  top: 50%;
  left: 50%;
  transform: translate(-50%);
  .button {
    font-family: Roboto Mono;
    letter-spacing: 0.4em;
    position: absolute;
    border: none;
    outline: none;
    width: 120px;
    height: 40px;
    background-color: #FFD139;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    color: white;
    user-select: none;
    &:before {
      content: '';
      position: absolute;
      width: 40px;
      height: 10px;
      left: -25px;
      bottom: 10px;
      background-color: #F9DD8F;
      transform: rotate(90deg) skew(45deg);
    }
    &:after {
      content: '';
      position: absolute;
      width: 120px;
      height: 10px;
      bottom: -10px;
      left: -5px;
      background-color: #E2B537;
      transform: skew(-45deg) rotate(0deg);
    }
    &.clicked {
      left: -5px;
      bottom: -5px;
      &:before {
        height: 5px;
        left: -22px;
        bottom: 15px;
      }
      &:after {
        height: 5px;
        bottom: -5px;
        left: -2px;
      }
    }
  }
}

$('.button').on('mousedown',function() {
  $(this).addClass('clicked');
});
$('.button').on('mouseup',function() {
  $(this).removeClass('clicked');
});