Change checkout button (cart)

[Prestawise]

Hi presta people

Im trying to change the "Checkout" button on my cart, but i cant get it to work. I have created a new button and added it to css, but when i try to change the button it looks kinda funny.

 {l s='Check out' mod='blockcart'} 

See the attached picture.

What am i doing wrong?

/Napz