html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    background: #000;
}

#controls-help {
    position: fixed;
    bottom: 16px;
    left: 16px;
    color: #fff;
    background: rgba(0, 0, 0, 0.55);
    padding: 10px 14px;
    border-radius: 4px;
    border: 1px solid #fff;
    font-family: 'Orbitron', sans-serif;
    font-size: 13px;
    line-height: 1.6;
    pointer-events: none;
    user-select: none;
}

#controls-help h2 {
    margin: 0 0 6px 0;
    font-size: 14px;
    letter-spacing: 0.05em;
}

#controls-help ul {
    margin: 0;
    padding-left: 18px;
}

#controls-help kbd {
    display: inline-block;
    padding: 1px 6px;
    border: 1px solid #fff;
    border-radius: 3px;
    font-family: inherit;
    font-size: 11px;
}