<!DOCTYPE html> <html> <body> <style> #triangle-up { width: 0px; height: 0px; border: 100px solid transparent; border-bottom: 100px solid red; } </style> <div id="triangle-up"></div> </body> </html> 相关文章： 2022-01-23 2022-12-23 2022-12-23 2022-12-23 2021-06-15 2021-09-11 2021-12-19