Remove unused CSS variables

[bakura10]

Hi :),

I am not sure if this is done on purpose but as of today, Tailwind generates a lot of CSS rules with properties like that:

It is highly improbable for us to use all the properties here, but all those are rendered over and over (this is the same for transform where skew are generated over and over, while we do not use them), giving some clutter to the generated CSS.

I wonder if Tailwind could optimize this by generating the variables dynamically, so if we do not have any class "backdrop-sepia" anywhere, it would not generate the associated CSS variables.