1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8" /> 5 <title></title> 6 <style type="text/css"> 7 *{ 8 margin:0; 9 padding:0; 10 } 11 div{ 12 width:0; 13 height:0; 14 border:50px solid; 15 border-color:transparent transparent yellow transparent; 16 margin:100px auto; 17 } 18 </style> 19 </head> 20 <body> 21 <div></div> 22 </body> 23 </html>
原文：https://www.cnblogs.com/liufuyuan/p/10259999.html