External Script>>>>>

https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js
https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.3/jquery.easing.min.js
/* Always check with your IT or InfoSec team when using External Scripts */


Style >>>>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center; 
  justify-content: center;
  
  min-height: 100vh;
  background: #0c0c0c;
  
}

a {
  position: relative;
  padding: 20px 50px;
  display: block;
  text-decoration: none;
  text-transform: uppercase;
  width: 200px;
  overflow: hidden;
  border-radius: 40px;
   
   margin: 35px;
}

#cpBackground {
position: fixed;
top: 0px;
right: 0;
left: 0;
bottom: 0px;
filter: brightness(90%);
}

#cpBackground img {
width: 100%;
height: 100%;

}

a span {
  position: relative;
  color: #fff;
  font-size: 20px;
  font-family: Arial;
  letter-spacing: 0px;
  z-index: 1;
 
   
  
}

a .liquid {
  position: absolute;
  top: -80px;
   left: 0;
  width: 200px;
  height: 200px;
  background: #4973ff;
    box-shadow: inset 0 0 50px rgba(0, 0, 0, .5);
  transition: .5s;
}

a .liquid::after,
a .liquid::before {
  content: '';
  width: 200%;
  height: 200%;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -75%);
  background: #000;
  padding: 40px;
}

a .liquid::before {
  
  border-radius: 45%;
  background: rgba(20, 20, 20, 1);
  animation: animate 5s linear infinite;
}

a .liquid::after {
  
  border-radius: 40%;
  background: rgba(20, 20, 20, .5);
  animation: animate 10s linear infinite;
}

a:hover .liquid{
  top: -120px;
}

@keyframes animate {
  0% {
    transform: translate(-50%, -75%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -75%) rotate(360deg);
  }
}