.gradient-custom {
    /* fallback for old browsers */
    background: #6a11cb;
    /* Chrome 10-25, Safari 5.1-6 */
    background: -webkit-linear-gradient(to right, rgba(222, 0, 0, 1), rgba(75, 45, 190, 1));
    /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
    background: linear-gradient(to right, rgba(222, 0, 0, 1), rgba(75, 45, 190, 1))
}