body{
  margin:0;
  padding: 0;

}
ul{

  margin: 0;
  padding: 0;
  display: flex;
  position: absolute;
  background-color:rgba(0,153,255,1);
  top:85%;
  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: #333;
  border-radius: 50%;
  font-size: 30px;
  color: #666;
  transition: .5s;
}
ul li a::before{

  content: " ";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: #ff0000;
  transition: .5s;
  transform: scale(.9);
  z-index: -1;
}
ul li a:hover{
  transform: scale(1,1);
  box-shadow: 0 0 15px #ffffff;
}

ul li a:hover{
  color: #ffffff;
  text-shadow: 0 0 5px #ffffff;
  box-shadow: 0 0 5px #ffffff;
}