Want to change HEADING_TITLE font size and color.

I am using the newest version of zenCart. I want to change the font-size and font-color of the HEADING_TITLE on the index page. I have looked at the stylesheet from includes/template/template_default/css and I see no reference to HEADING_TITLE. When I view source on my browser, I see that the text I want to change is showing as <h1 id="indexDefaultHeading">Text I want to change</h1>. I see no reference to indexDefaultHeading in the stylesheet either. What do I do? Am I looking in the wrong place? I don't want the HEADING_TITLE to be large and gray, I want the font smaller and black.

Look for h1 in the stylesheet

Thanks. I did not want to change all h1 instances, just this one. I tried to create a new class and change the size and color of the h1 in that class only but it did not seem to take. There were no changes. I finally went to the tpl_index.php and changed the HEADER_TITLE to <h4> instead of <h1>. Not sure what I was doing wrong to have no change on the earlier try.