iframe {
    width: 100%;
    height: 100%;
}

.ir-arriba {
    display: none;
    padding: 20px;
    background: #a3813b;
    font-size: 20px;
    color: #fff;
    cursor: pointer;
    position: fixed;
    bottom: 80px;
    right: 24px;
    z-index: 1;
}