Removing light grey borders around content in 'able'

link to site will help

Oh sorry, here it is: https://dbace.uk.com/

It works for me. Perhaps a typo?

.hentry {
border-bottom: 0 none;
box-shadow: none;
}
works using firebug. You may have a typo. Do other changes made work in the child theme?
I would try copying and pasting this to the bottom of the theme stylesheet and if this works it suggests a problem with the child theme setup.

Good morning guys, thanks loads for the advice, appreciated.
I’ll check out the firebug thing, I’ve had a brief look but need to head off to work.
Thanks again,
Jahn

The CSS in your child theme looks good, and I’m not seeing the grey borders around pages or posts. Are you all set at your end too?

Yes Marklcm & stephencottontail provided excellent support.
Thank you for taking a look.