centering a button in tne middle of a div in css code example

Example 1: how to make a button centered in html5

<!--Put the button inside a p like this-->
<p style="text-align: center;"><button>See?</button>Whatever</p>

Example 2: how do you center buttons in css

<div style="text-align:center;">
    <button>button1</button>
    <button>button2</button>
</div>