.overlay {
    position: fixed;
    top: 48px;
    right: 48px;
    left: auto;
    width: 400px;
    height: auto;
    background: none;
    z-index: 999999999;
    pointer-events: auto;
    display: block;
}

@media only screen and (max-width: 767px) {
    .overlay {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
    }
}