game.css

* {
    margin: 0;
    padding: 0;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

html, body {
    background: #000;
    font-family: Tahoma;
}

canvas {
    display: block;
}

div {
    position: fixed;
    top: calc(50% - 200px);
    left: 0;
    width: 100%;
    color: #CCC;
    z-index: 1;
    -webkit-filter: blur(0px);
    -moz-filter: blur(0px);
    opacity: 1;
    text-align: center;
    -webkit-transition: -webkit-filter 0.5s, opacity 1s;
    -moz-transition: -webkit-filter 0.5s, opacity 1s;
}

div.clear {
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    opacity: 0;
    pointer-events: none;
}

div h1 {
}

div p {
    font-size: 20px;
}

div h1, div p {
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

div button {
    padding: 1em;
    font-size: 20px;
    border: #fff 2px solid;
    background: #000;
    color: #fff;
    outline: 0;
}

div button:active {
    box-shadow: 0 0 20px rgba(255, 255, 255, 1);
    outline: 0;
    margin-top: 2px;
}