index.css

body {
  margin: 0;
  color: #eee;
  font-family: Monospace;
  font-size: 14px;
  background-color: black;
}
canvas {
  width: 100%;
  height: 100%;
}

.hidden {
    visibility: hidden;
}

a:link, a:visited {
  text-decoration: none;
  color: #eee;
}

.info {
  position: absolute;
  top: 20px;
  left: 30px;
}

.author {
  position: absolute;
  left: 30px;
  bottom: 20px;
  opacity: 0;
}

#current_move {
    position: absolute;
    width: 100%;
    text-align: center;
    bottom: 50px;
    font-size: 4em;
}

#confettiContainer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

#confetti {
    width: 100%;
    height: 100%;
}

.highlight {
    color: #2980b9;
}

.sk-cube-grid {
  width: 40px;
  height: 40px;
  margin: 100px auto;
}

.sk-cube-grid .sk-cube {
  width: 33%;
  height: 33%;
  background-color: #333;
  float: left;
  -webkit-animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
          animation: sk-cubeGridScaleDelay 1.3s infinite ease-in-out;
}
.sk-cube-grid .sk-cube1 {
    background-color: #C41E3A;
  -webkit-animation-delay: 0.2s;
          animation-delay: 0.2s; }
.sk-cube-grid .sk-cube2 {
    background-color: #009E60;
  -webkit-animation-delay: 0.3s;
          animation-delay: 0.3s; }
.sk-cube-grid .sk-cube3 {
    background-color: #0051BA;
  -webkit-animation-delay: 0.4s;
          animation-delay: 0.4s; }
.sk-cube-grid .sk-cube4 {
    background-color: #FF5800;
  -webkit-animation-delay: 0.1s;
          animation-delay: 0.1s; }
.sk-cube-grid .sk-cube5 {
    background-color: #C41E3A;
  -webkit-animation-delay: 0.2s;
          animation-delay: 0.2s; }
.sk-cube-grid .sk-cube6 {
    background-color: #C41E3A;
  -webkit-animation-delay: 0.3s;
          animation-delay: 0.3s; }
.sk-cube-grid .sk-cube7 {
    background-color: #FFD500;
  -webkit-animation-delay: 0s;
          animation-delay: 0s; }
.sk-cube-grid .sk-cube8 {
    background-color: #0051BA;
  -webkit-animation-delay: 0.1s;
          animation-delay: 0.1s; }
.sk-cube-grid .sk-cube9 {
    background-color: #FFD500;
  -webkit-animation-delay: 0.2s;
          animation-delay: 0.2s; }

@-webkit-keyframes sk-cubeGridScaleDelay {
  0%, 70%, 100% {
    -webkit-transform: scale3D(1, 1, 1);
            transform: scale3D(1, 1, 1);
  } 35% {
    -webkit-transform: scale3D(0, 0, 1);
            transform: scale3D(0, 0, 1);
  }
}

@keyframes sk-cubeGridScaleDelay {
  0%, 70%, 100% {
    -webkit-transform: scale3D(1, 1, 1);
            transform: scale3D(1, 1, 1);
  } 35% {
    -webkit-transform: scale3D(0, 0, 1);
            transform: scale3D(0, 0, 1);
  }
}