body {
    margin: 0;
    overflow: hidden;
    font: 1em 'Roboto', 'Helvetica', sans-serif;
}

#canvas {
    z-index: 1;
}

.mode-select {
    /* Position */
    position: absolute;
    top: 5px;
    right: 8px;
    z-index: 2;
    /* Style */
    -webkit-appearance: none;
    padding: .5em;
    outline: none;
    border: solid 1px rgba(250, 250, 250, .25);
    border-radius: 5px;
    background-color: rgba(200, 200, 200, .5);
    color: rgba(250, 250, 250, 1);
    text-align: center;
}

.mode-select:hover {
    background-color: rgba(200, 200, 200, .75);
    color: rgba(255, 255, 255, 1);
}

.restart-button {
    position: absolute;
    width: 6em;
    height: 3em;
    top: 60vh;
    left: calc(50% - 3em);
    z-index: 2;
    /* Style */
    -webkit-appearance: none;
    padding: .5em;
    outline: none;
    border: solid 1px rgba(250, 250, 250, .25);
    border-radius: 5px;
    background-color: rgba(200, 200, 200, .6);
    color: rgba(250, 250, 250, 1);
    text-align: center;
    font-size: 1em;
    box-shadow: 1px 1px 2px #7b7b7b7d;
}

.restart-button:hover {
    background-color: rgba(200, 200, 200, .75);
    color: rgba(255, 255, 255, 1);
    box-shadow: 1px 1px 2px #545353a3;
}

.pause-label {
    display: none;
    position: absolute;
    width: 3em;
    top: 45%;
    left: calc(50% - 1.5em);
    color: rgba(255, 255, 255, .8);
    font-size: 3em;
}