How to make Border like this style-CodePudding

i want to make like this style in hover with animation

CodePudding user response：

I got your query, I think below mentioned code is the solution for your query.

@import url('https://fonts.googleapis.com/css?family=Poppins:100,200,300,400,500,600,700,800,900');

        *{
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Poppins', sans-serif;
        }
        body{
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background-color: #0e1538;
        }
        .container{
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
        }
        .container a{
            position: relative;
            width: 160px;
            height: 60px;
            display: inline-block;
            background-color: #fff;
            margin: 20px;
        }
        .container a:before, .container a:after{
            content: '';
            position: absolute;
            inset: 0;
            /* background: #f00; */
            background: linear-gradient(45deg,#00ccff,#0e1538,#0e1538,#d400d4);
            transition: 0.2s;
        }
        .container a:hover:before{
            inset: -3px;
        }
        .container a:hover:after{
            inset: -3px;
            filter: blur(10px);
        }
        .container a span{
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: inline-block;
            background: #0e1538;
            z-index: 10;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.2em;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: #fff;
        }

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Glowing Gradient Border Effect</title>
</head>
<body>
    <div >
        <a href="#">
            <span>Button</span>
        </a>
    </div>
</body>
</html>