scroll-snap-align

scroll-snap-align: start;

scroll-snap-align: end;

scroll-snap-align: center;

<section class="default-example" id="default-example">
  <div id="example-parent">
    <div>1</div>
    <div id="example-element">2</div>
    <div>3</div>
  </div>
  <div class="info">Scroll »</div>
</section>

.default-example {
  flex-wrap: wrap;
}

.default-example .info {
  width: 100%;
  padding: 0.5em 0;
  font-size: 90%;
}

#example-parent {
  text-align: left;
  width: 250px;
  height: 250px;
  overflow-x: scroll;
  display: flex;
  box-sizing: border-box;
  border: 1px solid black;
  scroll-snap-type: x mandatory;
}

#example-parent > div {
  flex: 0 0 66%;
  width: 250px;
  background-color: rebeccapurple;
  color: white;
  font-size: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#example-parent > div:nth-child(even) {
  background-color: white;
  color: rebeccapurple;
}

/* Single keyword value */
scroll-snap-align: none;
scroll-snap-align: center;
scroll-snap-align: start;
scroll-snap-align: end;

/* Two keyword values */
scroll-snap-align: start end;
scroll-snap-align: end center;
scroll-snap-align: center start;

/* Global values */
scroll-snap-align: inherit;
scroll-snap-align: initial;
scroll-snap-align: revert;
scroll-snap-align: revert-layer;
scroll-snap-align: unset;