html - 非语义和语义 HTML

Question

我目前有下面的 HTML 和 CSS 代码，我在网页中将 div 用于不同的元素。您可以运行代码以查看下面的输出。我的讲师告诉我，它不是语义化的，需要将 div 更改为 main、section、article 等，但我不完全确定如何使用我在下面发布的 HTML 和 CSS 来执行此操作。你还能在 main、section 等中添加类吗？

 

   *{
  box-sizing: border-box;
}
    body{
      margin: 0;
      padding: 0;
      font:15px/1.5 Arial, Helvetica, sans-serif;
    }
    /*box display*/
    .box_content{
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
    }
/*box sizing*/
    .box_content .box{
      position: relative;
      width: 350px;
      padding: 30px;
      background:#2a333b;
      box-shadow: 0px 20px 25px rgba(0,0,0,.2);
      border-radius: 4px;
      margin: 30px;
      box-sizing: border-box;
      overflow: hidden;
      text-align: center;
    }
/*number icons*/
    .box_content .box .icon{
      position: relative;
      width: 80px;
      height: 80px;
      color: #fff;
      background: #000;
      display: flex;
      justify-content: center;
      align-items: center;
      margin: 0 auto;
      border-radius: 50%;
      font-size: 40px;
      font-weight: 700;
      transition: 1s;
    }
/*icon colouring*/
    .box_content .box .icon{
      box-shadow: 0 0 0 #4eb1ba;
      background: #4eb1ba;
    }
/*hovering*/
    .box_content .box:hover .icon{
      box-shadow: 0 0  0 400px #4eb1ba;
    }
/*position content*/
    .box_content .box .content{
      position: relative;
      z-index: 1;
      transition: 0.5s;
    }
/*title color*/
    .box_content .box .content {
      color: #fff;
    }
/*paragraph sizing*/
    .box_content .box .content p{
      margin: 10px;
      padding: 0;
    }
/*heading size*/
    .box_content .box .content h1{
      margin: 10px;
      padding: 0;
      font-size: 25px;
    }
/*links- read more*/
    .box_content .box .content a{
      display: inline-block;
      padding:10px 20px;
      background: #2a333b;
      color:#fff;
      border-radius: 4px;
      text-decoration: none;
      font-weight: 500;
      margin: 20px;
      box-shadow: 0 2px 5px rgba(0,0,0,.2);
    }
    */

    <div class="box_content">
      <div class="box">
        <div class="icon">01</div>
        <div class="content">
          <h1>Intro to Business Management</h1>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
          <a href="business.html">Read More</a>
        </div>
      </div>
      <div class="box">
        <div class="icon">02</div>
        <div class="content">
          <h1>Digital Identity</h1>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
          <a href="digital.html">Read More</a>
        </div>
      </div>
      <div class="box">
        <div class="icon">03</div>
        <div class="content">
          <h1>Information Systems & Databases</h1>
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
          <a href="database.html">Read More</a>
        </div>
      </div>
    </div>

标签： htmlcss