.gradient-custom {
    /* fallback for old browsers */
    background: #6a11cb;

    /* Chrome 10-25, Safari 5.1-6 */
    background: -webkit-linear-gradient(
        to right,
        rgb(203, 17, 17),
        rgb(40, 35, 33)
    );

    /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
    background: linear-gradient(to right, rgb(203, 17, 17), rgb(40, 35, 33));
}