CSS 流体布局的列堆叠？

Question

我有三列；左、中、右，它们位于屏幕宽度为 100% 的 div 中。在媒体查询中，当屏幕尺寸缩小时，我如何让中间的列留在顶部，让左边的列在下面，然后让右边的列在下面？我附上了一个 CodePen 并在下面显示了 HTML 和 CSS： https://codepen.io/Macast/pen/jZworE 。任何帮助将不胜感激！我不知道该怎么做。

这就是我要找的：

HTML:

<body>
<div class="columnContainer">
    <div class="leftColumn" style="background-color:#aaa;">
      <h2>Left Column</h2>
    </div>
    <div class="middleColumn" style="background-color:#bbb;">
      <h2>Middle Column</h2>
    </div>
    <div class="rightColumn" style="background-color:#ccc;">
      <h2>Right Column</h2>
    </div>
  </div>
</body>
</html>

CSS:

* {
    box-sizing: border-box;
}

body {
    margin: 0;
}

.columnContainer {
    width: 100%;
}

.leftColumn {
    float: left;
    width: 33.33%;
    padding: 10px;
    height: 200px;
    text-align: center;
}

.middleColumn {
    float: left;
    width: 33.33%;
    padding: 10px;
    height: 200px;
    text-align: center;
}

.rightColumn {
    float: left;
    width: 33.33%;
    padding: 10px;
    height: 200px;
    text-align: center;
}

.columnContainer:after {
    content: "";
    display: table;
    clear: both;
}

/* Media Query */
@media (min-width: 320px) and (max-width: 480px) {
    /* Column Stacking Here */
}

Answer 1

/* Media Query */
@media (max-width: 480px) {
  .leftColumn, .middleColumn, .rightColumn {
    float: left;
    width: 100%;
    padding: 10px;
    height: 200px;
    text-align: center;
}
}

Answer 2

您可以使用 flex + order;

* {
    box-sizing: border-box;
}

body {
    margin: 0;
}

.columnContainer {
    width: 100%;
    display: flex;
}

.leftColumn {
    width: 33.33%;
    padding: 10px;
    height: 200px;
    margin: 0 auto;
    text-align: center;
}

.middleColumn {
    width: 33.33%;
    padding: 10px;
    height: 200px;
    margin: 0 auto;
    text-align: center;
}

.rightColumn {
    width: 33.33%;
    padding: 10px;
    height: 200px;
    margin: 0 auto;
    text-align: center;
}

/* Media Query */
@media (min-width: 320px) and (max-width: 480px) {
  /* Column Stacking Here */

  .columnContainer {
      flex-direction: column;
  }

  .leftColumn {
      order: 2;
  }

  .middleColumn {
      order: 1;
  }

  .rightColumn {
      order: 3;
  }

}

<body>
<div class="columnContainer">
    <div class="leftColumn" style="background-color:#aaa;">
      <h2>Left Column</h2>
    </div>
    <div class="middleColumn" style="background-color:#bbb;">
      <h2>Middle Column</h2>
    </div>
    <div class="rightColumn" style="background-color:#ccc;">
      <h2>Right Column</h2>
    </div>
  </div>
</body>
</html>

CSS 流体布局的列堆叠？

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