SOURCE

<div class="a">
  <div class="b">
  </div>
  <div class="b">
  </div>
  <div class="b">
  </div>
  <div class="b">
  </div>
  <div class="b">
  </div>
</div>

.a {
  width: 300px;
  height: 100px;
  background-color: wheat;
  overflow-x: scroll;
  overflow-y: hidden;  /* 超出内容不可见 */ 
  white-space: nowrap;  /* 不换行 */ 
}

.b {
  background-color: greenyellow;
  width: 60px;
  height: 60px;
  margin: 10px;
  display:inline-block;
}