css 流式布局

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title></title>
    <style>
      .box {
        width: 200px;
        height: 150px;
        background-color: black;
        display: flex;
        flex-flow: row wrap;
        align-content: flex-start;
      }

      .point {
        box-sizing: border-box;
        background-color: white;
        flex: 0 0 25%;
        height: 50px;
        border: 1px solid red;
      }
    </style>
  </head>
  <body>
    <div class="box">
      <div class="point"></div>
      <div class="point"></div>
      <div class="point"></div>
      <div class="point"></div>
      <div class="point"></div>
      <div class="point"></div>
      <div class="point"></div>
      <div class="point"></div>
    </div>
  </body>
</html>