Button Trick in CSS

Guyzzz howz this button in CSS?
It is created in CSS with a simple way...

CSS Code:

button { background-color:#252424; color:#D3D3D3; border:2px solid black; -webkit-border-radius: 10px; border-radius: 10px; } button:hover { background-color:#696969; color:#D3D3D3; border:2px solid black; -webkit-border-radius: 10px; border-radius: 10px; }