.aventurecard {
  max-width: 600px;
  height: 600px;
  margin-bottom: 20px; /* Espaciado entre las tarjetas */
}

.contentx {
  position: relative;
  width: 100%;
  height: 100%;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
  transition: transform 1s;
  transform-style: preserve-3d;
}

.aventurecard:hover .contentx {
  transform: rotateY(180deg);
}

.front,
.back {
  position: absolute;
  height: 100%;
  width: 100%;
  background: white;
  line-height: 600px;
  color: #00205c;
  text-align: center;
  font-size: 36px;
  border-radius: 5px;
  backface-visibility: hidden;
}

.back {
  background: #00205c;
  color: white;
  transform: rotateY(180deg);
}