CSS_UNITS
Run 
<!DOCTYPE html>  
<html>  
<head>
	<title>CSS Units</title>  
	<style>  
		body{  
		text-align: center;  
		}  
		p{  
		line-height: 0.1cm;    
		}  
	</style>  
</head>  
<body>  
	<h1> Relative units </h1>  
	<p style = "font-size: 5em;">It has em unit.</p>  
	<p style = "font-size: 5ex;">It has ex unit</p>  
	<p style = "font-size: 5ch;">It has ch unit.</p>  
	<p style = "font-size: 5rem;">It has rem unit.</p>  
	<p style = "font-size: 5vw;">It has vw unit.</p>  
	<p style = "font-size: 5vh;">It has vh unit.</p>  
	<p style = "font-size: 5vmin;">It has vmin unit.</p>  
	<p style = "font-size: 5vmax;">It has vmax unit.</p>  
	<p style = "font-size: 100%;">It has % unit.</p>  
</body>  
</html>