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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> .addStyle { width: 500px; background-color: yellow; color: red; text-align: center; font-size: 20px; } </style> </head> <body> <div id="divId"> <h1>W3Docs</h1> </div> <button onclick="myFunction()">Click on button</button> <script> function myFunction() { document.getElementById("divId").className = "addStyle"; } </script> </body> </html>