Component Help

I am working on a new layout for component and I have looked and joined several communities hoping I could find help but I can't seem to find what I am looking for. I want to change the size of my entries box and I am not sure how to go about to do that. Any help would be so greatful. Thanks

hopefully this will be a pretty easy question.
i'm sure it's just something i'm missing.
staring at html for a long time will make you blind.
haha

ok, so here is how my base layout is.
i know how to resize the boxes (thanks to this community) and change the colors.
but i can't seem to find where the little lines in my background are coming from.
which means i can't get rid of them.
or change the background.
or whatever.

so, that's what i need help with.
either changing the background or just getting rid of the lines so it's one solid color.

thanks! ♥

i've been fiddling around and reading up on component codes and how to use them, but am still very lost on certain aspects...

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thanks for your help in advance :)