.carousel {
  position: relative;
  width: 500px;
  height: 300px;
  overflow: hidden;
  margin-bottom: 20px;
  background: #000;
}

.carousel img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity .6s ease;
}

.carousel img.active {
  opacity: 1;
  z-index: 1;
}

.carousel button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  background: rgba(0,0,0,0.5);
  color: #fff;
  border: none;
  padding: 8px 12px;
  cursor: pointer;
}

.carousel .prev { left: 10px; }
.carousel .next { right: 10px; }