css布局------上下高度固定,中间高度自适应容器

时间：2022-11-21 19:45:37

HTML

<body>
  <div class="container">
    <div class="header"></div>
    <div class="body"></div>
    <div class="footer"></div>
  </div>
</body>

CSS

body,html {
　 height:100%;
}
/*方法1：绝对定位实现*/
.container {
  box-sizing: border-box;
  position: relative;
  min-height: 100%;
  padding: 100px 0;
  background-color: blue;
}
.header {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100px;
  background-color: red;
}
.footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 100px;
  background-color: red;
}
/*方法2：弹性布局实现*/
.container {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.body {
  flex: 1 1 auto;
  background-color: blue;
}
.header, .footer {
  height: 100px;
  flex: 0 0 auto;
  background-color: red;
}

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