styling on woo checkout page

add this to your cart and you'll get to the ckeckout page: http://kungfuadvertising.com/rm/product/the-redemption-retreat-2/

What css can I use to change the color of the bar asking for a coupon and the place order button (just add a random color for the hex). ALso, what css would make the apply coupon button correct height and how could I change it's color as well