page title size

This is a simple site with one page and a form. I don’t like how huge the titles are, so I left the main page untitled. But the form page is titled “Contact Us” and I can change the color, alignment of that with additional css, but the size won’t change. I’m using the h1 tag in custom css. What do I need to add so the font-size will change?

The page I need help with: [log in to see the link]