Struggling to make a single block full width

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Hi everyone, I’m using the astra theme (free). The page is set up for no sidebar and content layout to customiser setting.

I have a single video block I’m trying to make/force full page width. When I change the page to full width/stretched it’s fine, but the rest of the blocks get messed up.

From what I understand I need to add a small amount of custom css and call it up in the specific block. I’ve searched the sub and lost the code snippet, can someone help at all what it should be?

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Many thanks

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