twitter-bootstrap - 根据另一个 Div 保持高度

Question

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Answer 1

将 position:absolute 添加到您的 COL2 的所有 child ，这样它就不会影响 COL2 的高度。

.col-6 h1 {
  color: white;
  text-align: center;
}

h1 {
  background-color: red;
  position: absolute;
  left: 0;
  right: 0;
  height: 50px;
  margin: 0 !important;
}

.COL1,
.COL2 {
  border: 1px solid red;
}

.COL2 .top-banner {
  top: 0;
}

.COL2 .bottom-banner {
  bottom: 0;
}

.COL2 div {
  position: absolute;
  top: 50px;
  left: 0;
  bottom: 50px;
  right: 0;
  overflow: auto;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<div class='container'>
  <div class='row'>
    <div class='col-6 COL1'>
      Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper
      curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi nibh
      habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.
    </div>
    <div class='col-6 COL2'>
      <h1 class="top-banner">ADVERTISE</h1>
      <div>Lorem ipsum dolor sit amet consectetur adipiscing elit risus conubia ante, congue faucibus ac a non aptent nisi per commodo facilisi id, tempus lacus maecenas tincidunt mus sociosqu elementum ornare eget. Nascetur vestibulum hac tempor integer semper
        curae tempus etiam massa, platea fusce pellentesque aenean conubia at lectus non penatibus, nibh venenatis himenaeos scelerisque placerat imperdiet dignissim felis. Feugiat fames lectus magna aenean porttitor taciti hendrerit, integer facilisi
        nibh habitant dignissim sollicitudin aliquam, massa faucibus dictumst maecenas rhoncus sapien.</div>
      <h1 class="bottom-banner">ADVERTISE</h1>
    </div>
  </div>
</div>