body { margin: 0; padding: 0; background: #000; } a { posi | Imon

body {
margin: 0;
padding: 0;
background: #000;
}
a {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%,-50%);
width: 200px;
height: 60px;


#fff;
font-size: 24px;
text-transform: uppercase;
text-decoration: none;


#03a9f4, #f441a4, #ffeb3b, #03a9f4);
background-size: 400%;
border-radius: 30px;
z-index: 1;
}
a:hover {
animation: animate 8s linear infinite;
}
@keyframes animate {
0% {
background-position: 0%;
}
100% {
background-position: 400%;
}
}
a:before {
content: '';
position: absolute;
top: -5px;
bottom: -5px;
right: -5px;
left: -5px;
z-index: -1;
background: linear-gradient(90deg, #03a9f4, #f441a4, #ffeb3b, #03a9f4);
background-size: 400%;
border-radius: 40px;
filter: blur(20px);
opacity: 0;
transition: 0.5s;
}
a:hover:before {
filter: blur(20px);
opacity: 1;
animation: animate 8s linear infinite;
}