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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .mystyle { width: 100%; padding: 25px; background-color: coral; color: white; font-size: 25px; box-sizing: border-box; margin-top: 15px; } .newone { width: 50px; padding: 10px; background-color: green; color: white; margin-top: 15px; } </style> </head> <body> <p>Click the "Try it" button to change the class of the DIV element from "mystyle" to "newone":</p> <button onclick="myFunction()">Try it</button> <div id="myDIV" class="mystyle"> This is a DIV element. </div> <script> function myFunction() { const element = document.getElementById("myDIV"); element.classList.remove("mystyle"); // Remove mystyle class element.classList.add("newone"); // Add newone class } </script> </body> </html>
