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HTML 

              
                
<div class="goobutton">
  <div class="gootext">
    button
  </div>
  <div class="goocontainer">
    <div class="blob"></div>
    <div class="blob"></div>
    <div class="blob"></div>
    <div class="blob"></div>
  </div>
</div>
<svg xmls="http://www.w3.org/2000/svg" version="1.1" >
  <filter id="goo">
    <fegaussianblur in="SourceGraphic" stdDeviation="10" result="blur"></fegaussianblur>
    <fecolormatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7" result="goo"></fecolormatrix>
    <feblend in="SourceGraphic" in2="goo"></feblend>
  </filter>
</svg>


<br>
• Disecting the button from: <a target="_blank" href="http://2015.isl.co/">2015.isl.co</a>
<br>
<br> • This "gooey" effect works thanks to an an SVG filter. This article does a decent job of explaining what is necessary to create this effect.  <a target="_blank" href="https://css-tricks.com/gooey-effect/"> https://css-tricks.com/gooey-effect/</a><br><br>
• “...not all browsers support [SVG filters] being applied to regular DOM elements, notably Safari. However, they do work at least on Firefox and Chrome, even the Android version...”
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CSS 

              
                /* Just realized they're using an SVG filter... need to learn this: https://css-tricks.com/gooey-effect/ */

body {
  background-image: url("http://2015.isl.co/img/isl-yir-intro-7480337676.jpg");
  background-size: cover;
  color: #fff;
  font-family: sans-serif;
  margin-top: 100px;
}

a {
  color: #ffd615;
}

.goobutton {
  position: absolute;
  left: 0;
  right: 0;
  width: 160px;
  height: 60px;
  border: 7px solid #ffd615;
  margin: auto;
  overflow: hidden;
}

.gootext {
  position: absolute;
  top: 20px;
  color: #fff;
  z-index: 100;
  text-align: center;
  left: 0;
  right: 0;
  margin: auto;
  font-family: "Roboto", sans-serif;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.goocontainer {
  width: 100%;
  height: 100%;
  position: absolute;
  overflow: hidden;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  z-index: -1;
  filter: url('#goo');
  -webkit-filter: url('#goo');
}

.blob {
  width: 30%;
  border-radius: 100%;
  position: absolute;
  display: block;
  background-color: #ffd615;
  transition: all .5s;
  height: 60px;
}

.blob:nth-child(1) {
  left: -5%;
  transition-delay: 0s;
  transform: scale(1.3) translateY(125%) translateZ(0);
}

.goobutton:hover .blob:nth-child(1) {
  transform: scale(1.3) translateY(0px) translateZ(0);
}

.blob:nth-child(2) {
  left: 20%;
  transition-delay: 50ms;
  transform: scale(1.3) translateY(125%) translateZ(0) rotate(0deg);
}

.goobutton:hover .blob:nth-child(2) {
  transition-delay: .1s;
  transform: scale(1.6) translateY(0) translateZ(0) rotate(25deg);
}

.blob:nth-child(3) {
  left: 45%;
  transition-delay: 25ms;
  transform: scale(1.6) translateY(125%) translateZ(0);
}

.goobutton:hover .blob:nth-child(3) {
  transition-delay: 50ms;
  transform: scale(1.6) translateY(0) translateZ(0);
}

.blob:nth-child(4) {
  left: 75%;
  transition-delay: 50ms;
  transform: scale(1.6) translateY(125%) translateZ(0) rotate(0);
}

.goobutton:hover .blob:nth-child(4) {
  transition-delay: 120ms;
  transform: scale(1.6) translateY(0) translateZ(0) rotate(-25deg);
}
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