<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> .demo { height: 100px; background-color: grey; width: 50%; margin: 0 auto; line-height: 100px; } .demo span { font-size: 16px; vertical-align: top; } </style> </head> <body> <div class="demo"> <span>你好</span> </div> </body> </html>
