flex 实现多行项目动态堆叠，随着屏幕尺寸而扩展减少

当您增加或减少屏幕尺寸时，这些 flex 项目会缩小和增长。

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .parent {
      display: flex;
      flex-wrap: wrap;
    }

    .parent {
      width: 100%;
      height: 100%;
    }
    .box {
      font-size: 2rem;
      padding: 1rem;
      display: grid;
      place-items: center;
      border-radius: 1rem;
      border-style: dashed;
    }
    .box {
      flex: 1 1 150px;
      flex: 0 1 150px;
      margin: 5px;
    }
  </style>
</head>
<body>
  <div class="ex-container" style="width: 100%; height: 100%; display: flex; justify-content: center; align-items: center;">
    <div class="" style="
      box-sizing: border-box;
      width: 90%;
      height: 100%;
      padding: 20px;
    ">
      <div class="parent white">
        <div class="box green">1</div>
        <div class="box green">2</div>
        <div class="box green">3</div>
        <div class="box green">4</div>
        <div class="box green">5</div>
      </div>
    </div>
  </div>
</body>
</html>

实现效果