JSFiddle - React, Tailwind, and code Playground

HTML

<div class='wrap'>
  <div class='cube'>
    <div class='side top'>
      <span class='topRotate'>G</span>
    </div>
    <div class='side left'>
      A
    </div>
    <div class='side front'>
      Y
    </div>
 </div>
</div>

CSS

.wrap {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 1px dotted red;
}

.cube {
  display: flex;
  flex-wrap: wrap;
  width: 40px;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(-45deg) rotateY(45deg);

  /* transform: rotateY(45deg) rotateX(-45deg); */
}

.side {
  width: 20px;
  height: 20px;
  padding: 5px 0;
  box-sizing: border-box;
  line-height: 10px;
  text-align: center;
  background-color: lightblue;
}

.top {
  margin-left: 20px;
  transform-origin: bottom;
  transform: rotateX(90deg);
}

.topRotate {
  display: block;
  transform: rotateZ(45deg);
}

.left {
  transform-origin: right;
  transform: rotateY(-90deg);
}