<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div class="all">
    <div class="left">
      left
    </div>
    <div class="right">
    </div>
  </div>
</body>
<style>
  .all{
    height: 300px;
  }
  .left{
    width: 200px;
    float: left;
    background: blue;
  }
  /* 不设置width marge-left原则 */
  .right{
    margin-left: 200px;
    height: 300px;
    background: yellow;
    /* overflow: hidden; */
  }
  /* bfc原则：overflow不和 浮动区域重叠 */
  .right{
    margin-left: 200px;
    height: 300px;
    background: yellow;
    /* overflow: hidden; */
  }
</style>
</html>

1-1,父元素display：table，子元素display：table-cell，设置固定宽度（常用）

css布局——左侧宽度固定，右侧自适应_html

css布局——左侧宽度固定，右侧自适应_html_02