Library for fading flashing/steady LEDs

Hi! Beginner here.

Is there a library that's good for fading LEDs? I need to fade lights that can flash in sync with each other, light up steady, or go out completely.

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You could try 'FadeLEd' in the IDE library manager.

Have a look at Examples/Basic/Fade

just to provide more info regarding @dougp's answer

Take note of this from the source code

This video will lead you through making your own LED library...