<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style type="text/css"> .box{ width: 400px; height: 300px; background-color: darkgreen; border: 10px solid lawngreen; border-radius: 100px; box-shadow: 50px 30px 30px #cccccc; } </style> </head> <body> <div class="box">这是一个带阴影的盒子</div> </body> </html>