<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>class类型选择器</title>
<style type="text/css">
.class01{
color:blue;
font-size:30px;
border: 1px solid yellow;
}
.class02{
color: grey;
font-size:26px;
border:1px solid red;
}
</style>
</head>
<body>
<!--
需求1：修改class属性值为class01的span或div标签，字体颜色为蓝色，字体大小为30个像素。边框为1像素黄色实线
需求2：修改class属性值为class02的 div标签，字体颜色为灰色，字体大小为26个像素。边框为1像素红色实线
-->
<div class="class01">div标签class01</div>
<div class="class02">div标签</div>
<span class="class01">span标签class01</span>
<span>span标签2</span>
</body>
</html>