.expand {
    position: fixed;
    width: 100vw;
    height: 100vh;
    left: 0;
    top: 0;
    border: 0;
    margin: 0;
    z-index: 999;
    border-radius: 0;
    transition: .2s;
    padding-bottom: 200px;
}

.expand-fixed {
    position: fixed;
    bottom: 10px;
    z-index: 1000;
    width: 100%;
    max-width: 90vw;
    left: 50%;
    transform: translate(-50%);
    transition: .2s;
}