【图形】CSS绘制正方形
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <base target="_blank" /> <title>三十客 - 【图形】CSS绘制正方形</title> <style> #square { width: 200px; height: 200px; background: red; } </style> </head> <body> <div id="square"></div> </body> </html>