.banner-container{
    position: fixed;
    bottom: 50px;
    max-width: 1100px;
    max-height: calc(1100px / 3);
    width: 95vw;
    background-color: #eee;
    border-radius: 15px;
    box-shadow: 1px 1px 10px #6e6e6e;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9;
    overflow: hidden;
    animation: slide-in .8s;
    display: block;
}

.banner-container > a > img{
    height: 100%;
    width: 100%;
}

.banner-container > button{
    position: absolute;
    right: 10px;
    top: 10px;
    font-size: large;
    font-weight: 700;
    color: #eee;
    height: 35px;
    width: 35px;
}

@keyframes slide-in {
  from { bottom: -450px; }
  to   { bottom: 100px; }
}

@keyframes slide-out {
  from { bottom: 100px; }
  to   { bottom: -450px; }
}

@media only screen and (max-width: 600px) {
    .banner-container > button{
        height: 25px;
        width: 25px;
        right: 5px;
        top: 5px;
    }
}