body {
  background: #1d1f20;
  margin: 0;
  padding: 0;
}
.container {
    transform-style: preserve-3d;
    transform: rotateX(10deg);
    margin-top: 25%;
}
.letter {
    color: #ff4742;
    text-shadow: 0px 0px 10px rgba(255,255,255,.2);
    position: absolute;
    width: 40px;
    height: 40px;
    margin-left: -20px;
    margin-top: -20px;
    text-align: center;
    line-height: 44px;
    backface-visibility: visible;
}