.btn-xs {
    font-size:14px!important;
}

@media(min-width:800px) {

    #banner {
        position: relative;
    }

    #banner:before {
        content: "";
        background: url("/images/shadow.png") center bottom / contain no-repeat;
        width: 50vw;
        height: 100vw;
        position: absolute;
        left: -25%;
        bottom: -70px;
        z-index: -1;
    }

}