<section class="s1">
  <a href="#" class="iconbtn fas fa-laptop"></a>
  <a href="#" class="iconbtn fas fa-mobile-alt"></a>
  <a href="#" class="iconbtn fas fa-cog"></a>
  <a href="#" class="iconbtn fas fa-link"></a>
</section>

<section class="s2">
  <a href="#" class="iconbtn fas fa-laptop"></a>
  <a href="#" class="iconbtn fas fa-mobile-alt"></a>
  <a href="#" class="iconbtn fas fa-cog"></a>
  <a href="#" class="iconbtn fas fa-link"></a>
</section>

<section class="s3">
  <a href="#" class="iconbtn fas fa-laptop"></a>
  <a href="#" class="iconbtn fas fa-mobile-alt"></a>
  <a href="#" class="iconbtn fas fa-cog"></a>
  <a href="#" class="iconbtn fas fa-link"></a>
</section>

<section class="s4">
  <a href="#" class="iconbtn fas fa-laptop"></a>
  <a href="#" class="iconbtn fas fa-mobile-alt"></a>
  <a href="#" class="iconbtn fas fa-cog"></a>
  <a href="#" class="iconbtn fas fa-link"></a>
</section>

body{
  margin: 0;
  padding: 0;
}
section{
  height: 25vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.s1{
  background: #3498db;
}

.s2{
  background: #e74c3c;
}

.s3{
  background: #2ecc71;
}

.s4{
  background: #34495e;
}
.iconbtn{
  width: 80px;
  height: 80px;
  text-decoration: none;
  margin: 20px;
  position: relative;
  font-size: 30px;
  border-radius: 50%;
}
.iconbtn::before{
  position: absolute;
  z-index: 1;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
}
.iconbtn::after{
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  border-radius: 50%;
  z-index: 0;
}

.s1 .iconbtn,.s2 .iconbtn{
  color: #fff;
}
.s1 .iconbtn::after{
  border: 4px dashed;
}
.s1 .iconbtn:hover::after{
  animation: ro 7s linear infinite;
}


.s2 .iconbtn{
  border: 4px solid;
}
.s2 .iconbtn:hover{
  animation: ro 2s linear infinite;
}


.s3 .iconbtn{
  border: 4px solid #fff;
  color: #2ecc71;
}
.s3 .iconbtn::after{
  background: #fff;
  transition: 0.2s;
}
.s3 .iconbtn:hover::after{
  transform: scale(.9);
}


.s4 .iconbtn{
  border: 4px solid #fff;
  color: #34495e;
}
.s4 .iconbtn::after{
  background: #fff;
  transition: 0.4s;
}
.s4 .iconbtn:hover::after{
  transform: scale(1.3);
  opacity: 0;
}
.s4 .iconbtn:hover{
  color: #fff;
}

@keyframes ro {
  0%{
    transform: rotate(0);
  }
  100%{
    transform: rotate(360deg);
  }
}

/*
* https://www.darkcode.info/2019/01/awesome-icons-hover-effect-using-only.html
*/