@hectorperez did you find anything for solving the issue, i am having the same issue 
Hey @hectorperez I’m having a similar issue here… I’m trying to add some custom css but it isn’t working… Did you find a solution?
Hi @Swordfest, I ended up disabling preflight and adding preflight’s source without background-color: transparent; — as suggested by konsalex here
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I finally solved my problem by declaring the preflight = false on the tailwind.config.js… then I declared my classes on the input.css and activated the preflights again…
