Pressed <button> selector

Question

I\'d like to create a button that changes its style when it gets pressed. This is my CSS code:

Answer 1

Maybe :active over :focus with :hover will help! Try

button {
background:lime;
}

button:hover {
background:green;
}

button:focus {
background:gray;
}

button:active {
background:red;
}

Then:

Demo

Then:

 Sorry about that last one. :) I was just showing you a cool function! 
Wait... did I just emphasize a code block? This is cool!!!