If we want buttons to stack on top of each other, we can use the <br> tag to place each button on a new line.

<html>
<body>
<h3>Stack of Pancakes</h3>
<p>Log in or sign up to view the best photos of pancakes across the globe.</p>
<button>Login</button>
<br>
<button>Sign up</button>
</body>
</html>]]>

Make sure to spell <br>.