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Page Widget - 如何将滚动条添加到左侧栏...

sidebar 【sidebar】
我们想知道如何将滚动条添加到左侧栏。...
代码展示 运行结果 

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.container {
  position: relative;
}

.sidebar {
  position: absolute;
  right: 0;
  width: 150px;
}

.sidebar+.content {
  margin-right: 150px;
}

.content {
  background-color: yellow;
  height: 300px;
}

.sidebar {
  background-color: blue;
  height: 200px;
}
</style>
</head>
<body>
  <div class='container'>
    <div class='sidebar'></div>
    <div class='content'></div>
  </div>
  <br />
  <div class='container'>
    <div class='content'></div>
  </div>
</body>
</html>