<div class="examples">
  <div>
    <p>Example 1 - No snapping</p>
    <div class="carousel example-1">
      <div class="slides">
        <div class="slide">1</div>
        <div class="slide">2</div>
        <div class="slide">3</div>
        <div class="slide">4</div>
        <div class="slide">5</div>
      </div>
    </div>
  </div>
  <div>
    <p>Example 2 - Snapping</p>
    <div class="carousel example-2">
      <div class="slides">
        <div class="slide">1</div>
        <div class="slide">2</div>
        <div class="slide">3</div>
        <div class="slide">4</div>
        <div class="slide">5</div>
      </div>
    </div>
  </div>
  <div>
    <p>Example 3 - Snapping + Margins</p>
    <div class="carousel example-3">
      <div class="slides">
        <div class="slide">1</div>
        <div class="slide">2</div>
        <div class="slide">3</div>
        <div class="slide">4</div>
        <div class="slide">5</div>
      </div>
   </div>
</div>

.examples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
}

p {
  text-align: center;
}

.carousel {
  width: 200px;
  height: 400px;
  margin: 25px;
  border: 1px solid gray;
  overflow-x: hidden;
  overflow-y: auto;
}

.slides {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  width: 100%;
  height: fit-content;
}

.slide {
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: row;
  background: #eee;
}

.slide:nth-child(2n) {
  background: #ddd;
}

.carousel.example-1 {
}

.carousel.example-2 {
  scroll-snap-type: y mandatory;
}

.carousel.example-2 > .slides > .slide {
  scroll-snap-align: start;
}

.carousel.example-3 {
  scroll-snap-type: y mandatory;
}

.carousel.example-3 > .slides > .slide {
  scroll-snap-align: start;
}

.carousel.example-3 > .slides > .slide:first-child {
  margin-top: 100px;
}

.carousel.example-3 > .slides > .slide:last-child {
  scroll-snap-align: end;
  margin-bottom: 100px;
}