style.css

div#main {
    margin: auto;
    position: relative;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

div#info {
    display: flex;
}

#info > .infosection {
    padding: 10px;
    text-transform: uppercase;
    font-family: sans-serif;
    font-size: 20px;
}

.container {
    width: 95%;
    height: 95%;
    position: relative;
    perspective: 600px;
}

#board {
    flex-grow: 100;
}


#light {
    width: 100%;
    height: 100%;
    position: absolute;
    transform-style: preserve-3d;
    transition: 0.3s;
}

#light figure {
    margin: 0;
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    transform-origin:50% 50%;
    border-radius: 30%;
}

#light .on {
  background: #FFFF77;
}

#light .off {
  background: grey;
  transform: rotateY( 180deg );
}

#light.flipped {
  transform: rotateY( 180deg );
}