Gradient Button.
<!DOCTYPE html>
<html>
<head>
<title>Gradient</title>
<link rel="stylesheet" type="text/css" href="style.css">
<style type="text/css">
body{
margin: 0;
padding: 0;
background: #000;
}
a{
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50% -50%);
width: 200px;
height: 60px;
text-align: center;
line-height: 60px;
color: #fff;
font-size: 24px;
text-transform: uppercase;
text-decoration: none;
font-family: "Lucida Grande", "Lucida Sans Unicode", "Lucida Sans", "DejaVu Sans", Verdana, "sans-serif";
box-sizing: border-box;
background: linear-gradient(90deg,#03a9f4,#f441a5,#ffeb3b,#03a9f4);
background-size: 400%;
border-radius: 30px;
}
a:hover{
animation: animate 8s linear infinite;
}
@keyframes animate{
0%
{
background-position: 0%;
}
100%
{
background-position: 400%;
}
}
a:before{
content: '';
position: absolute;
top: -5px;
left: -5px;
right: -5px;
bottom: -5px;
z-index: -1px;
background: linear-gradient(90deg,#03a9f4,#f441a5,#ffeb3b,#03a9f4);
background-size: 400%;
border-radius: 40px;
opacity: 0;
transition: 0.5s;
}
a:hover:before{
filter: blur(20px);
animation: animate 8s linear infinite;
}
</style>
</head>
<body>
<a href="#">Button</a>
</body>
</html>