styles.css

@font-face {
  font-family: "Asap";
  font-style: normal;
  font-weight: 400;
  src: local("Asap Regular"), local("Asap-Regular"),
    url("/fonts/Asap-Medium.ttf") format("truetype");
}
@font-face {
  font-family: "Asap";
  font-style: bold;
  font-weight: 700;
  src: local("Asap Bold"), local("Asap-Bold"),
    url("/fonts/Asap-Bold.ttf") format("truetype");
}

body {
  background: #eee;
  font-family: "Asap";
  font-weight: bold;
}

.card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 300px;
  height: 300px;
  margin: -150px;
  float: left;
  perspective: 500px;
}

.content {
  position: absolute;
  width: 100%;
  height: 100%;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);

  transition: transform 1s;
  transform-style: preserve-3d;
}

.card:hover .content {
  transform: rotateX(180deg);
  transition: transform 0.5s;
}

.front,
.back {
  position: absolute;
  height: 100%;
  width: 100%;
  background: white;
  line-height: 300px;
  color: #00829B;
  text-align: center;
  font-size: 60px;
  border-radius: 5px;
  backface-visibility: hidden;
}

.back {
  background: #00829B;
  color: white;
  transform: rotateX(180deg);
}