SOURCE

<h1>学习科目</h1>
<h2>姓名</h2>
<p>学号<p>
    <footer class="p2">
      
      
      <div class="p1">
        <p>生物</p>
        <p>语文</p>
        <p>数学</p>
      </div>
      
      
      <p>英语</p>
      <p>物理</p >
      
</footer>

h1 {color: red}


h2,p {color: green;}

.p1 p {font-size: 50px;}

.p1 p,h2 {background-color: blue;}

div p {color: yellow;}

footer>p {color: pink;font-size: 30px;}

div+p {background-color: green;}

div~p {
  font-size: 30px;
}

p:first-child {background-color: red;}

h1:first-letter {font-size: 40px;}