page title Background Image Issues

Hello, I’m trying to add an image across the top of all my pages (except my home page. I think creating a page title with background image is the best way to do that. If not, please send me in the right direction.
If page title background is the right answer, can you help me with dimensions? I read these threads: https://hb-themes.com/forum/all/topic/image-dimensions/ and https://hb-themes.com/forum/all/topic/page-title-with-background-image/ and have added this CSS to my page:
hb-page-title { display: none; }
.background-fill { background-size:contain !important }

but am still getting title text and a poorly shaped image at the top of my pages. I’ve included a screenshot instead of a my page because I don’t want to leave the page title visible in it’s sad state. It’s currently showing no page title at all.
Thanks for your help!

(btw, I’m aiming for this type of look on my page when done.) http://www.chalenejohnson.com/about-chalene-johnson/