Html 如何在小屏幕中制作水平滚动div

.container { container-type: inline-size; }

.parent {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-auto-rows: 100px;
  gap: 5px;
  overflow-x: auto;
}

.parent::before {
  content: "";
  grid-column: span 5;
  grid-row: span 2;
}

.child {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-color: dodgerblue;
  min-width: 200px;
}

.child:first-child {
  width: 100cqi;
  height: 205px;
  position: fixed;
}

@container (min-width: 500px) {
  .parent {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .parent::before {
    display: none;
  }
  
  .child:first-child {
    position: static;
    width: auto;
    height: auto;
    grid-area: 1 / 1 / 3 / 3;
  }
}

<div class="container">
  <div class="parent">
    <div class="child">1</div>
    <div class="child">2</div>
    <div class="child">3</div>
    <div class="child">4</div>
    <div class="child">5</div>
    <div class="child">6</div>
  </div>
</div>

<hr />

<div class="container" style="max-width: 400px;">
  <div class="parent">
    <div class="child">1</div>
    <div class="child">2</div>
    <div class="child">3</div>
    <div class="child">4</div>
    <div class="child">5</div>
    <div class="child">6</div>
  </div>
</div>