Styling the 'entry-title' – right combo of class and divs is confusing me

I’m having a problem with the single post page.
https://www.startingpointstables.com/2011/09/more-kids/

I’ve tried a multitude of ways to change it to look like the ones below (is it .one-column #container .entry-title, etc etc etc).

Compared to a regular page https://www.startingpointstables.com/contact-us/ , or a category of posts https://www.startingpointstables.com/category/kayes-blog/.