Article in English: This method describes how to use the HTML <center> tag, which is now obsolete. As of December 2018, this tag may still work in some web browsers, however, it's not advised to rely on this tag in the long run. Scroll down until you find the header, paragraph, or other text that you want to center. The center tag is in the format <center>text</center> where "text" is your text. If your text has tags on it (e.g., "<p></p>" for paragraph text), the "center" tags can go outside the existing tags:   <center><h1>Welcome to My Website</h1></center> <center>Make yourself at home!</center> Your document should look something like this:  <!DOCTYPE html> <html> <body>  <h1><center>Welcome to My Website</center></h1> <center>Make yourself at home!</center> <p1>The purpose of this website is to display information about things.</p1>  </body> </html>

Summary in Vietnamese:
Mở tài liệu HTML. Xác định văn bản mà bạn muốn căn giữa. Thêm thẻ "center" vào hai đầu văn bản. Xem lại tài liệu HTML.