Hm... the colors is the easiest way, because every color has a "hex code" and if you know this code, you can change it easily... like for example the white here in the background...
White is always #ffffff And black is always #000000
So if you would for example want to change the white background in this layout here, you would "only" have to open the "customize layout" thing in your choosen layout and type strg+f and then in the searching field ffffff and change all those codes to the color you want (the hex code of the color)
I mostly "find out" the colors/hex codes via photoshop...
It's all a bit complicated, but if you know how, it's actually very easy... and like I said: with photoshop it's easier than ever, but there are also hex-code charts online, so you could always look there! :)
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White is always #ffffff
And black is always #000000
So if you would for example want to change the white background in this layout here, you would "only" have to open the "customize layout" thing in your choosen layout and type strg+f and then in the searching field ffffff and change all those codes to the color you want (the hex code of the color)
I mostly "find out" the colors/hex codes via photoshop...
It's all a bit complicated, but if you know how, it's actually very easy... and like I said: with photoshop it's easier than ever, but there are also hex-code charts online, so you could always look there! :)