Remove title (word white bar) from pages?

I am using Hueman theme, and my site is trisef.com. I would like to remove page titles (either for single pages or all pages), including the white title bar. I’ve tried plugins that remove both the title and the bar, but they leave the little gray line that sits at the bottom of the bar, which prevents images from being flush with the header. How do I remove the title, the bar, and the line? Thank you.