PHP Guest Book - backend.html

This code was written for php guest book project

<!DOCTYPE html>
<html>
	
	<link rel="stylesheet" type="text/css" href="css/guest_book_styles.css"/>
	<meta name="viewport" content="width=768px, munumum-scale=1.0, maximum-scale=1.0" />

	<div class="backend">
		<h1 class="backend">Guest Book Back-End</h1>
		<button class="backend" type="button" onclick="location.href='php/visits.php'"> View Visits</button>
		<button class="backend" type="button" onclick="location.href='php/export_visits.php'"> Export All Visits </button> 
		<button class="backend" type="button" onclick="location.href='php/export_guest.php'"> Export Guest List </button> 
	</div>
	
	<iframe class="footer" src="footer.html"></iframe>	
	
</html>