How do I fix my computer´s color?

I draw on my computer, but when I color it the way I want, it seems fine.. until I download it to my phone, then the color is way more saturated.. I have no idea why the colors on my computer are slightly more dull, and it isnt anything to do with my room lighting and such. My computer is pretty old, maybe thats it?
Update: Update: I just fiddled around with the display settings but it only seemed to make it worse.. pls help aaa
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