.slider {
  width: 300px;
  height: 210px;
  overflow: hidden;
  position: relative;
  margin: 20px auto;
  border: 2px solid #000;
  border-radius: 10px;
}

.slides {
  display: flex;
  width: 1200px; /* 4 slides × 300px */
  height: 210px;
  transition: transform 0.5s ease-in-out;
}

.slides img {
  width: 300px;
  height: 210px;
  object-fit: cover;
}

.navigation-dots {
  text-align: center;
  position: absolute;
  bottom: 8px;
  width: 100%;
}

.dot {
  height: 10px;
  width: 10px;
  margin: 0 5px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  cursor: pointer;
}

.dot.active {
  background-color: #333;
}