<div style="height:200px">滚动试试</div>
<div class="box box1">box1</div>
<div class="box box2">box2</div>
<div class="box box3">box3</div>
<div style="height:200px"></div>

.box {
  position: -webkit-sticky;
  position: sticky;
  width: 100%;
  height: 30px;
  text-align: center;
  color: #fff;
  margin-bottom: 50px;
}

.box1 {
  top: 0;
  z-index: 1;
  background: #007bff;
}

.box2 {
  top: 30px;
  z-index: 1;
  background: #ffc107;
}

.box3 {
  background: #f4516c;
}

External CSS

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External JavaScript

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