Change Price in Hikashop

I have installed Hikashop in this template because Hikashop is a better webshop-extension at this moment.
Now I want to style Hikashop like VM of your Quick-start. Such as the block of the price. Is that al lot of work and difficult? Like this:

span.PricesalesPrice {
display: block;
width: 65px;
height: 65px;
line-height: 65px;
color: #FFF !important;
font-weight: 900;
font-size: 14px !important;
text-align: center;
background: #FF8261 none repeat scroll

I see its standing in template_css.css. But how can I use it in HS? Do you have experience with Hikashop?

Sorry, but we can't offer support for Hikashop. Please look for help on official Hikashop forum.

Thanks