html,body {
	text-align: center;
	height: 100%;
	width: 100%;
	overflow: hidden;
}

body.day {
    background: #fff;
}
body.night {
    background: #000;
}
table {
    wdith: 100%;
    height: 100%;
}
table tr td {
    vertical-align: middle;
    text-align: center;
}