.holographic-card {
  width: 300px;
  height: 200px;
  background: #111;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  border-radius: 15px;
  transition: all 0.5s ease;
}

/* White */

.holographic-card.holo-white::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    0deg, 
    transparent, 
    transparent 30%, 
    rgba(255,255,255,0.3)
  );
  transform: rotate(-45deg);
  transition: all 0.5s ease;
  opacity: 0;
}

.holographic-card.holo-white:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(255,255,255,0.5);
}

/* Yellow */

.holographic-card.holo-yellow::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    0deg, 
    transparent, 
    transparent 30%, 
    rgba(255, 217, 0, 0.5)
  );
  transform: rotate(-45deg);
  transition: all 0.5s ease;
  opacity: 0;
}

.holographic-card.holo-yellow:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(255, 217, 0, 0.5);
}

/* Green */

.holographic-card.holo-green::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    0deg, 
    transparent, 
    transparent 30%, 
    rgba(0, 255, 64, 0.5)
  );
  transform: rotate(-45deg);
  transition: all 0.5s ease;
  opacity: 0;
}

.holographic-card.holo-green:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(0, 255, 64, 0.5);
}

/* Red */

.holographic-card.holo-red::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    0deg, 
    transparent, 
    transparent 30%, 
    rgba(156, 0, 8, 0.5)
  );
  transform: rotate(-45deg);
  transition: all 0.5s ease;
  opacity: 0;
}

.holographic-card.holo-red:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(156, 0, 8, 0.5);
}

/* Blue */

.holographic-card.holo-blue::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    0deg, 
    transparent, 
    transparent 30%, 
    rgba(0, 89, 255, 0.5)
  );
  transform: rotate(-45deg);
  transition: all 0.5s ease;
  opacity: 0;
}

.holographic-card.holo-blue:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(0, 89, 255, 0.5);
}

.holographic-card:hover::before {
  opacity: 1;
  transform: rotate(-45deg) translateY(100%);
}

.card-container {
  display: flex;
  justify-content: center;
}

.card-container a {
  text-decoration: none;
}

@media (max-width: 1000px) {
  .card-container {
    flex-direction: column;
    align-items: center;
    padding-top: 0px;
  }

  .first-card-bottom {
    margin: 0px !important;
  }
}