.seitenbanner {
    width: 200px;
    position: fixed;
    color: white;
    text-align: center;
    transform: rotate(45deg);
    top: auto;
    bottom: -39px;
    left: -75px;
    z-index: 10;
    font-size: 20px;
    height: 124px;
    transition: all 0.25s ease-in-out;
}

.seitenbanner:hover {
    cursor: pointer;
    width: 250px;
    height: 145px;
    bottom: -34px;
    left: -88px;

}