body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }

    .border {
        border-image: linear-gradient(to left, rgba(149, 7, 251, 0.364), rgba(96, 65, 202, 0.215), rgba(237, 250, 38, 0.886), rgba(225, 29, 89, 0.086), rgba(161, 78, 214, 0.266), rgba(205, 58, 211, 0.525), rgba(235, 218, 33, 0.078), rgba(79, 148, 166, 0.619)) 1 / 0.20em 0 0;
    }