<html> <head> <title> New Document </title> <style> p.cls1{ color:red;}p.cls2{ color:green; } </style> </head> <body> <p class="cls2">hello,world</p> <p class="cls1">abcdefg</> </body></html>
同一html元素分類：
<html> <head> <title> New Document </title> <style> p.cls1{ color:red;}p.cls2{ color:green; } *{ margin:0px; padding:0px; } </style> </head> <body> <p class="cls2">hello,world</p> <p class="cls1">abcdefg</> </body></html>
萬用字元選取器：讓瀏覽器的預設邊界都為0px;
四種選取器的優先順序：
id選取器》類別選取器》html選取器》萬用字元選取器
margin知識：
margin:0px; 上右下左都是0px;
margin:10px 10px; 上下 左右
margin:10px 10px 10px 上 左右 下
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