new subtitle text colors

[Pasithea0]

This pull request resolves #93

Added custom color picker for caption color

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• [x] I have read and complied with the contributing guidelines.
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[Saioni1]

Oh thanks man

[ztpn]

Can we add an option for custom colors?

[Pasithea0]

Can we add an option for custom colors?

I can try, but the problem is that the css for the colors is generated when building. So it wouldn't be simple.

[Pasithea0]

Can we add an option for custom colors?

Added 😘

[ztpn]

Also the custom color button looks ugly It doesn't need to be bigger or have an outline Should have some icon