body {
  background: #000;
}

.zone {
  width: 800px;
  height: 600px;
  background: #000;
  margin: auto;
  -webkit-filter: blur(15px) saturate(800%);
          filter: blur(15px) saturate(800%);
  cursor: none;
}
.zone .blob {
  width: 90px;
  height: 67.5px;
  margin: 20px 20px;
  background: red;
  float: left;
  border-radius: 100%;
  -webkit-transform: translateZ(0);
          transform: translateZ(0);
}
.zone .repulse {
  width: 90px;
  height: 67.5px;
  background: lightblue;
  display: block;
  position: absolute;
  border-radius: 100%;
  -webkit-filter: saturate(600%);
          filter: saturate(600%);
}