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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>jQuery css()</title> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script> $(document).ready(function() { $("#button").click(function() { $("p").css("font-size", "20px"); }); }); </script> </head> <body> <p>This is first paragraph</p> <p>This is another paragraph</p> <button style="margin:0 0 10px 0;background:#e8e8e8;" class="btn" id="button">Click here to set a specific value for all matched elementt</button><br /> </body> </html>