Mobile Customisation - Simple Theme Help

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Hello everyone

I'm  currently using the simple theme. It looks great on desktop, however on mobile, the hamburger menu and white space above and below it take too much space for my liking. Is there a way I can reduce this space on mobile only and make the hamburger menu smaller and thinner? I also want my products to be single column on mobile, at the moment there are two columns. Any help would be hugely appreciated!
Thanks in advance,