html,
body {
    cursor: wait;
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    background: #555;
    color: white;
    text-align: center;
}

setTimeout(function unwait() {
    document.body.style.cursor = 'default';
    document.body.innerHTML = 'Loaded.';
}, 3000);