.wrapper, .main-header, footer, .control-sidebar {
    display: none;
}

body:before {
    content: 'To use this site enable JavaScript in your browser settings, and then refresh this page.';

    color: white;
    font-family: sans-serif;
    font-size: 1em;
    font-weight: bold;
    text-align: center;

    width: 100%;
    padding: 1em 0;

    background: rgba(0, 0, 0, 0.9);

    position: fixed;
    top: 0;
    left: 0;
    z-index: 99999;
}