Help me in solving JS20A problem

My issue

I don’t know why I have entered the code correctly as per the solution is given my code is perfect but when I am clicking on the submit button its showing the status that “DID YOU ADD THE NEW CONTENT IN INDEX.JS”

My code

// Add the code below this line
document.body.innerHTML = '<h2>CodeChef is the best!!!</h2>';

Learning course: Web development using JavaScript
Problem Link: CodeChef: Practical coding for everyone