It is not quite clear what you're looking for. It seems you want to apply a different CSS style to the h1 tag of the QA section. By different I mean you want to keep the default to the rest of the site. You can't do that without getting your hands dirty and perform a small core hack. You could do this by means of a theme but it will be a bit more complicated.
So here are the steps to add a CSS class only to that section:
1. Open file qa-include/qa-theme-base.php
2. Perform the changes I've made in this
Gist:
if (isset($favorite))
$this->output('<form '.$favorite['form_tags'].'>');
- $this->output('<h1>');
+ $class = $this->template === 'qa' ? ' class="recent-questions"' : '';
+
+ $this->output('<h1' . $class . '>');
$this->favorite();
$this->title();
$this->output('</h1>');
3. Open file qa-theme/<your-theme>/qa-styles.css and add the style you want to the recent-questions class:
h1.recent-questions {
color: red;
}