html, body {
    width: 100%;
    height: 100%;
}

body {
    background-size: cover;
    background-repeat: no-repeat;
}

.container {
    position: absolute;
    *zoom: 1;
    height: 340px;
    width: 940px;
    top: 45%;
    left: 50%;
    margin-left: -470px;
    margin-top: -170px;
}

.container .message {
    height: 100px;
}