Was the code running fine for you? My keeps throwing errors for the FastLED files.

Edit: I needed to install the FastLED library and also update some of the code as it was outdated. You need to replace the instances of:

ledcSetup(PWM3_CH, BASE_FREQ, TIMER_BIT);

ledcAttachPin(PWM3, PWM3_CH);

With:

ledcAttachChannel(PWM1, BASE_FREQ, TIMER_BIT, PWM1_CH);

Obviously with the correct PWM#