<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div >注: 如果是大公司共同开发代码时,css可能是美工完成的 直接改别人的代码方法不可取 ===================================
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.class1{
color: #48f444;
}
.big{
font-size: 90px;
color: #0000cc;
}
.small{
font-size: 30px;
color: red;
}
</style>
</head>
<body>
<div ></html>
================================== 注:此方法是通过添加已有的未引用的样式表到标签中去 ==============================================