style.css

@font-face {
  font-family: "Cantique-Normal";
  src: url("Cantique-Normal.woff2")
    format("woff2");
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: none;
  background-color: #efefef;
}

.card {
  margin: auto; /* centrer la carte au milieu de la page, nécessaire d'avoir mis body avant */
  margin-top: 100px;
  width: 300px;
  height: 450px;
  border-radius: 20px; /* bord arrondi */
  background-color: black;
  display: flex;
  transform-style: preserve-3d;
  transform: perspective(1000px);
}

.card-title {
  font-family: "Cantique-Normal";
  position: absolute;
  text-align: center;
  margin: auto;
  left: 0;
  right: 0;
  top: 20px;
  font-size: 32px;
  color: white;
}

.cercle {
  width: 120px;
  height: 120px;
  border-radius: 50%; /* permet de faire un cercle en css */
  background-color: white;
  margin: auto;
  transform: translateZ(70px);
}

#extension {
  font-family: "Cantique-Normal";
  font-size: 20px;
  position: absolute;
  display: flex;
  bottom: 1px;
  color: white;
  left: 20px;
}

#numero {
  font-family: "Cantique-Normal";
  font-size: 20px;
  position: absolute;
  bottom: 1px;
  color: white;
  right: 20px;
}