scroll-margin-inline-end

scroll-margin-inline-end: 0;

scroll-margin-inline-end: 20px;

scroll-margin-inline-end: 2em;

<section class="default-example" id="default-example">
  <div class="scroller">
    <div>1</div>
    <div id="example-element">2</div>
    <div>3</div>
  </div>
  <div class="info">スクロール »</div>
</section>

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

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

.scroller {
  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;
}

.scroller > div {
  flex: 0 0 250px;
  width: 250px;
  background-color: rebeccapurple;
  color: white;
  font-size: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  scroll-snap-align: end;
}

.scroller > div:nth-child(even) {
  background-color: white;
  color: rebeccapurple;
}

/* <length> 値 */
scroll-margin-inline-end: 10px;
scroll-margin-inline-end: 1em;

/* グローバル値 */
scroll-margin-inline-end: inherit;
scroll-margin-inline-end: initial;
scroll-margin-inline-end: revert;
scroll-margin-inline-end: revert-layer;
scroll-margin-inline-end: unset;

<div class="scroller">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
</div>

.scroller {
  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;
}

.scroller > div {
  flex: 0 0 250px;
  width: 250px;
  background-color: rebeccapurple;
  color: white;
  font-size: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  scroll-snap-align: end;
}

.scroller > div:nth-child(2n) {
  background-color: white;
  color: rebeccapurple;
}

.scroller > div:nth-child(2) {
  scroll-margin-inline-end: 1rem;
}

.scroller > div:nth-child(3) {
  scroll-margin-inline-end: 2rem;
}