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<!DOCTYPE html> <html lang="en"> <head> <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script> <meta charset="utf-8"> <title>How to add class in jQuery</title> <style> .container { width: 100%; border: 4px solid green; padding: 20px; background-color: orange; } </style> </head> <body> <div> <h3>jQuery Tutorial</h3> </div> <br> <button type="button">Add Class</button> <script> $(document).ready(function() { $("button").click(function() { $("div").addClass("container"); }); }); </script> </body> </html>