.banner {
    position: fixed;
    width: 380px;
    height: 200px;
    left: -310px;
    top: 70%;
    margin-top: -100px;
    z-index: 2000;
    
    -webkit-transition: all 1000ms ease;
    -moz-transition: all 1000ms ease;
    -ms-transition: all 1000ms ease;
    transition: all 1000ms ease;
}
.banner.active,
.banner:hover {
    left: 0;
}