html, body
{
    margin: 0;
    padding: 0;
}

body
{
    background: #000;
    color: #fff;
    font-size: 12px;
    font-family: Arial, Helvetica, sans-serif;
}

canvas
{
    position: absolute;
    left: 0;
    top: 0;
    z-index: 1;
}

h1
{
    position: relative;
    z-index: 2;
    margin: 5px;
    font-weight: bold;
    font-size: 14px;
}

#buttons
{
    position: absolute;
    text-align: center;
    z-index: 2;
    bottom: 0;
    left: 0;
    right: 0;
}

#collision
{
    position: absolute;
    left: 0;
    vertical-align: middle;
    text-align: center;
    bottom: 0;
    right: 0;
    padding-bottom: 2em;
    font-size: 25px;
    color: #f00;
    display: none;
}