<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#frozen-btn {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
button {
border: 0;
margin: 20px;
text-transform: uppercase;
font-size: 20px;
font-weight: bold;
padding: 15px 50px;
border-radius: 50px;
color: white;
outline: none;
position: relative;
}
button:before{
content: '';
display: block;
background: linear-gradient(to left, rgba(255, 255, 255, 0) 50%, rgba(255, 255, 255, 0.4) 50%);
background-size: 210% 100%;
background-position: right bottom;
height: 100%;
width: 100%;
position: absolute;
top: 0;
bottom:0;
right:0;
left: 0;
border-radius: 50px;
transition: all 1s;
-webkit-transition: all 1s;
}
.green {
background-image: linear-gradient(to right, #25aae1, #40e495);
box-shadow: 0 4px 15px 0 rgba(49, 196, 190, 0.75);
}
.purple {
background-image: linear-gradient(to right, #6253e1, #852D91);
box-shadow: 0 4px 15px 0 rgba(236, 116, 149, 0.75);
}
.purple:hover:before {
background-position: left bottom;
}
.green:hover:before {
background-position: left bottom;
}
</style>
</head>
<body>
<div id="frozen-btn">
<button class="green">Hover me</button>
<button class="purple">Hover me</button>
</div>
</body>
</html>
