.slider {
  position: relative;
  width: 100%;
  max-width: 800px;
  overflow: hidden;
  border: 2px solid #ddd;
  border-radius: 10px;
}

.slides {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.slide {
  min-width: 100%;
}

.slide img {
  width: 100%;
  display: block;
}

button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0, 0, 0, 0.5);
  color: #fff;
  border: none;
  padding: 10px;
  cursor: pointer;
  z-index: 10;
  border-radius: 50%;
}

button.prev {
  left: 10px;
}

button.next {
  right: 10px;
}

/* スマートフォン対応 */
@media (max-width: 768px) {
  .slider {
    width: 100%;
    border: 1px solid #ccc;
  }

  button {
    padding: 8px;
    font-size: 14px;
  }
}

/* 極小デバイス対応 */
@media (max-width: 480px) {
  button {
    padding: 5px;
    font-size: 12px;
  }
}