#container {
    position: relative;
    height: 100%;
    width: 100%;
}

#main {
    position: absolute;
    top: 50%;
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
    width: 100%;
    text-align: center;
    font-size: 3em;
}

a {
    text-decoration: none;
}