body {
    /*background-color: rgb(215, 218, 219);*/
}

.slider {
  position: relative;
  width: 100%;
  max-width: 800px;
  margin: auto;
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.slide {
  display: none;
  transition: opacity 0.8s ease-in-out;
}

.slide.active {
  display: block;
}

.slide img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.slider button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0,0,0,0.5);
  color: white;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  padding: 0 12px;
  border-radius: 6px;
}

.slider button:hover {
  background: rgba(0,0,0,0.8);
}

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