<button class="bubbly-button">Click me!</button>

$fuschia: #ff0081;
$button-bg: $fuschia;
$button-text-color: #fff;
$baby-blue: #f8faff;

body{
  font-size: 16px;
  font-family: 'Helvetica', 'Arial', sans-serif;
  text-align: center;
  background-color: $baby-blue;
}
.bubbly-button{
  font-family: 'Helvetica', 'Arial', sans-serif;
  display: inline-block;
  font-size: 1em;
  padding: 1em 2em;
  margin-top: 100px;
  margin-bottom: 60px;
  -webkit-appearance: none;
  appearance: none;
  background-color: $button-bg;
  color: $button-text-color;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  position: relative;
  transition: transform ease-in 0.1s, box-shadow ease-in 0.25s;
  box-shadow: 0 2px 25px rgba(255, 0, 130, 0.5);
  
  &:focus {
    outline: 0;
  }
  
  &:before, &:after{
    position: absolute;
    content: '';
    display: block;
    width: 140%;
    height: 100%;
    left: -20%;
    z-index: -1000;
    transition: all ease-in-out 0.5s;
    background-repeat: no-repeat;
  }
  
  &:before{
    display: none;
    top: -75%;
    background-image:  
      radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle,  transparent 20%, $button-bg 20%, transparent 30%),
    radial-gradient(circle, $button-bg 20%, transparent 20%), 
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle,  transparent 10%, $button-bg 15%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%);
  background-size: 10% 10%, 20% 20%, 15% 15%, 20% 20%, 18% 18%, 10% 10%, 15% 15%, 10% 10%, 18% 18%;
  //background-position: 0% 80%, -5% 20%, 10% 40%, 20% 0%, 30% 30%, 22% 50%, 50% 50%, 65% 20%, 85% 30%;
  }
  
  &:after{
    display: none;
    bottom: -75%;
    background-image:  
    radial-gradient(circle, $button-bg 20%, transparent 20%), 
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle,  transparent 10%, $button-bg 15%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%),
    radial-gradient(circle, $button-bg 20%, transparent 20%);
  background-size: 15% 15%, 20% 20%, 18% 18%, 20% 20%, 15% 15%, 10% 10%, 20% 20%;
  //background-position: 5% 90%, 10% 90%, 10% 90%, 15% 90%, 25% 90%, 25% 90%, 40% 90%, 55% 90%, 70% 90%;
  }
 
  &:active{
    transform: scale(0.9);
    background-color: darken($button-bg, 5%);
    box-shadow: 0 2px 25px rgba(255, 0, 130, 0.2);
  }
  
  &.animate{
    &:before{
      display: block;
      animation: topBubbles ease-in-out 0.75s forwards;
    }
    &:after{
      display: block;
      animation: bottomBubbles ease-in-out 0.75s forwards;
    }
  }
}


@keyframes topBubbles {
  0%{
    background-position: 5% 90%, 10% 90%, 10% 90%, 15% 90%, 25% 90%, 25% 90%, 40% 90%, 55% 90%, 70% 90%;
  }
    50% {
      background-position: 0% 80%, 0% 20%, 10% 40%, 20% 0%, 30% 30%, 22% 50%, 50% 50%, 65% 20%, 90% 30%;}
 100% {
    background-position: 0% 70%, 0% 10%, 10% 30%, 20% -10%, 30% 20%, 22% 40%, 50% 40%, 65% 10%, 90% 20%;
  background-size: 0% 0%, 0% 0%,  0% 0%,  0% 0%,  0% 0%,  0% 0%;
  }
}

@keyframes bottomBubbles {
  0%{
    background-position: 10% -10%, 30% 10%, 55% -10%, 70% -10%, 85% -10%, 70% -10%, 70% 0%;
  }
  50% {
    background-position: 0% 80%, 20% 80%, 45% 60%, 60% 100%, 75% 70%, 95% 60%, 105% 0%;}
 100% {
    background-position: 0% 90%, 20% 90%, 45% 70%, 60% 110%, 75% 80%, 95% 70%, 110% 10%;
  background-size: 0% 0%, 0% 0%,  0% 0%,  0% 0%,  0% 0%,  0% 0%;
  }
}

var animateButton = function(e) {

  e.preventDefault;
  //reset animation
  e.target.classList.remove('animate');
  
  e.target.classList.add('animate');
  setTimeout(function(){
    e.target.classList.remove('animate');
  },700);
};

var bubblyButtons = document.getElementsByClassName("bubbly-button");

for (var i = 0; i < bubblyButtons.length; i++) {
  bubblyButtons[i].addEventListener('click', animateButton, false);
}