I can send you my template , I don't have any problem with it , I have 1.7.6 , so you can copy my style.css , if you want I can send you my template , I have no problem , its not too much different with 1.7.7 , I dont think that its a lot of work to copy that , I can help you .I think that you can only change style.css and it will be black with grey font so fully working black template , I suggest you to create layout from Thunderstrike , Rinaldo told me about that , if you want to create new template , for sure do it with this Tweak , it will help you a lot .