.bottom-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    margin: 0 auto;
    width: 100%;
    max-width: 1920px;
    height: 50dvh;
    background: url("../img/fondo/biblioteca.png") no-repeat center bottom;
    background-size: cover;
    z-index: 0;
}