#container ul {
  list-style: none;
  padding: 0;
  display: inline-block;
  flex-wrap: wrap;
  flex-direction: column;
  margin: 50;
  background-color: rgba(255,255,255,0.7);
}

li {
  padding: 10px;
  margin: 5px;
  border: 1px solid black;
}

#container li:hover {
  background: #f4f4f4;
}

.sortable-drag {
  opacity: 0.5;
  background-color: #f4f4f4;
}

.cube {
  position: relative;
  left: 10%;
  width: 200px;
  height: 200px;
  transform-style: preserve-3d;
  transform: rotateX(-15deg) rotateY(-15deg);
  animation: spin 15s infinite linear;
}

.side {
  position: absolute;
  padding: 0px;
  width: 190px;
  height: 190px;
  background-color: rgba(255, 0, 255, 0.8);
  border: 1px solid #ccc;
  font-size: 24px;
  text-align: center;
  line-height: 160px;
  transition: transform 0.5s ease-in-out;
  backface-visibility: hidden;
}

.front {
  transform: translateZ(100px);
  background-color: rgba(255, 100, 100, 0.99);
}

.back {
  transform: rotateY(180deg) translateZ(100px);
  background-color: rgba(0, 255, 0, 0.99); 
}

.right {
  transform: rotateY(90deg) translateZ(100px);
  background-color: rgba(0, 255, 0, 0.3); 
}

.left {
  transform: rotateY(-90deg) translateZ(100px);
  background-color: rgba(0, 255, 0, 0.3); 
}

.top {
  transform: rotateX(90deg) translateZ(100px);
  background-color: rgba(50, 50, 50, 0.7); 
}

.bottom {
  transform: rotateX(-90deg) translateZ(100px);
  background-color: rgba(50, 50, 50, 0.7); 
}

@keyframes spin {

  10% {
    transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg);
  }
  20% {
    transform: rotateY(90deg);
  }
  28% {
    transform: rotateY(90deg) rotateZ(90deg);
  }
  30% {
    transform: rotateY(90deg) rotateZ(90deg) rotateY(270deg);
  }
  33% {
    transform: rotateY(90deg) rotateZ(90deg) rotateY(270deg);
  }
  40% {
    transform: rotateY(90deg) rotateZ(90deg) rotateX(90deg);
  }
  50% {
    transform: rotateY(90deg) rotateZ(90deg) rotateX(90deg) rotateY(90deg);
  }
  90% {
    transform: rotateY(0deg) rotateZ(0deg) rotateX(0deg);
  }
}

.center {
  margin: auto;
  width: 50%;
}