How to create cube with only HTML and CSS?

Question

I have this and I want to make a cube with HTML & CSS only like in the above image. My best try:

Answer 1

A single box and 2 pseudos can do this as well.

http://codepen.io/gc-nomade/pen/vGeajp

#square {

  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  background: #C52329;
  /*box-shadow: 0 0 5px;*/
  width: 90px;
  height: 150px;
  margin: 5em;
  position: relative;
  transform: skew(30deg) rotate(30deg);
}

#square:before,
#square:after {
  display: inherit;
  align-items: center;
  justify-content: center;
  content: 'before';
  position: absolute;
  top: 0;
  left: 2px;
  right: -2px;
  bottom: 0;
  background: inherit;
  border-radius: inherit;
  box-shadow: inherit;
  transform: translate(100%, -31%) skew(0, -45deg) rotate(0deg);
}
#square:after {
  content: 'after';
  top: -2px;
  left: 0%;
  height: 60%;
  right: 0;
  bottom: 2px;
  transform: translate(50%, -100%) rotate(0deg)skew(-45deg)
}

  boxe