I am unable to understand what is the problem in my text ,i am unable to click on the save and submit button each time i click it represent the error message


<!DOCTYPE html>
		<link type="text/css" rel="stylesheet" href="stylesheet.css"/>
		<h1>I'm going to be a serif font when I grow up!</h1>
		<h2>I'm going to be a sans-serif font.</h2>
		<h3>I'm going to be in cursive!</h3>

in css style sheet

/*Add your CSS below!*/
h2{    font-family:sans-serif,sans-serif;}
h3{    font-family:cursive,vivaldi;}


hey anyone plz help me out as i am unable to underastand what is wrong with my code??


in h1, Times should be before serif, in h2 the first value should be serif, not sans-serif, take a close look at which font-family's start with uppercase and lowercase letter