html, body {
    height: 100%;
}

body {
    background-image: url(buraquarium-kyooki.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    transition: background 1.5s linear;
}

.main {
    height: 100%;
    width: 100%;
    display: table;
}

.email {
    display: table-cell;
    height: 100%;
    vertical-align: middle;
    color: #ffffff;
    text-shadow: #000000 0 0 12px;
    text-align: center;
    font-size: 8em;
    font-family: 'Varela Round', sans-serif;
}