body {
    min-height: 100vh;
    background-color: #000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #666;
    font-family: Arial, Verdana, sans-serif;
}

#main > p {
    width: 800px;
    display: block;
    position: relative;
    font-size: 0.8em;
    text-align: center;
}

#main > p:first-of-type {
    margin-top: 2em;
}

a {
    color: #777;
}

.strike {
    text-decoration: line-through;
}

div#game, div#game-wrapper, div#floating {
    width: 800px;
    height: 600px;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

div#game {
    background-color: #663366;
}

div#floating {
    float: left;
    position: relative;
    top: -600px;
    z-index: 10;
    color: #FFF;
    font-family: 'Orbitron', Arial, Verdana, sans-serif;
    font-size: 1.5em;
}

div.center {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    text-align: center;
    justify-content: center;
}

div.cover-game {
    width: 800px;
    height: 600px;
    float: left;
}

div.semiopaque {
    background-color: rgba(0, 0, 0, 0.5);
}

div.shadow-text {
    text-shadow: 2px 2px #000;
}

div.center-text {
    max-width: 700px;
    padding: 0 50px 0 50px;
    width: 100%;
    text-align: center;
}

div.corner {
    position: absolute;
    bottom: 0;
    right: 0;
    padding-right: 30px;
    padding-bottom: 30px;
}

div.corner input[type=checkbox] {
    height: 20px;
    width: 20px;
    margin: 0;
}

div#timer h3 {
    margin: 0;
    padding: 0;
}

.flex-title {
    flex-basis: 100%;
    text-align: center;
}

div.level {
    position: relative;
    margin: 0 20px 30px 20px;
    padding: 0;
    width: 200px;
    height: 120px;
    background-color: rgba(0, 0, 0, 0.5);
    color: #666;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
}

div.level.active {
    cursor: pointer;
    color: #999;
}

div.level.selected {
    background-color: rgba(255, 255, 255, 0.5);
    color: #000;
}