Help with Buttons

Site URL: https://www.sweetaddictiontoffee.com/new-home-page-1%C2%A0

I am working on a quick website facelift for a client on 7.0 https://www.sweetaddictiontoffee.com/new-home-page-1 

I am looking to make ONLY the three buttons on this section of the home page larger without changing the rest of the poster block buttons on the site. 

Add to Design > Custom CSS

/* Poster buttons */
div#page-602ffa536c2b2d4f2292663c .design-layout-poster a {
    padding: 20px 30px;
}