body, html {
    height: 100%;
    margin: 0;
}

.bgimg {
    background-image: url('under_construction.png');
    height: 100%;
    background-position: center;
    background-size: cover;
    position: relative;
    color: white;
    font-family: "Courier New", Courier, monospace;
    font-size: 25px;
}