Please bring back custom CSS

I loved my Canvas theme so much, and I had put a lot of effort into customizing it deeply using CSS. Now, literally overnight, my theme is completely broken, and I cannot for the life of me find a way to put it back the way it was. I also hate the fact that we can no longer set our colors exactly as we want to; there should be no reason that our themes that we use on our computers should have the contrast policed. PLEASE let us use custom CSS again :(