代码：

        body{

        padding:0;

        margin:0;

        font-family:'Poppins',sans-serif;

        display:flex;

        justify-content:center;

        align-items:center;

        min-height:100vh;

        background:#060c21;

    }

.box{

        position:relative;

        width:300px;

        height:400px;

        display:flex;

        justify-content:center;

        align-items:center;

        background:#060c21;

    }

.box:before{

        content:'';

        position:absolute;

        top: -2px;

        left: -2px;

        right: -2px;

        bottom: -2px;

        background:#fff;

        z-index: -1;

    }

.box:after{

content:'';

        position:absolute;

        top: -2px;

        left: -2px;

        right: -2px;

        bottom: -2px;

        background:#fff;

        z-index: -2;

        filter:blur(40px);

    }

.box:before,

 .box:after{

background:linear-gradient(235deg,#89ff00,#060c21,#00bcd4);

    }

.content{

padding:20px;

        box-sizing:border-box;

        color:#ffffff;

    }

</style>

<div class="box">

    <div class="content">

        <h1>Daydream delusion

        <p>Limousine EyelashOh,baby with your pretty face　Drop a tear in my wineglass　Look at those big eyes　See what you mean to me　Sweet cakes and milkshakes　I am a delusioned angel　　I am a fantasy parade.　I want you to know what I think.

        </p>

    <div>

</div>