类选择器

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.fanfan{ /*声明类样式*/
color: red;
}
.guoguo{
color: blue;
}

</style>
</head>
<body>
<div class="fanfan"> 饭饭 </div> 
<div class="guoguo"> 果果 </div>
<div> 零食 </div>
</body>
</html>