body {
  margin:0;
  padding:0;
  
}

ul {
  margin:0;
  padding:0;
  display:flex;
  position: absolute;
  top: 50%;
  left:50%;
  transform: translate(-50%, -50%);
}

ul li {
  list-style:none;
  margin: 0 15px;
}

ul li a {
  position: relative;
  display: block;
  width: 60px;
  height: 60px;
  text-align: center;
  line-height: 60px;
  background: #333333;
  border-radius: 50%;
  font-size: 35px;
  color: #b611e9;
  transition: .5s;
}

ul li a:before {
  content: '';
  position: absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  border-radius:50%;
  background: #b611e9;
  transition: .5s;
  transform: scale(.9);
  z-index: -1;
}

ul li a:hover:before {
  transform: scale(1.2);
  box-shadow: 0 0 15px #b611e9;
  filter: blur(3px);
}

ul li a:hover {
  color: #FD1C03;
  box-shadow: 0 0 15px #FD1C03;
  text-shadow: 0 0 15px #FD1C03;
}