My post background isn’t white

Since I updated to version 2.7, the background for my postings have been blackish gray. I thought it has something to do with my theme but I can’t tell. I am running the newest version of everything, and my theme is inove. If someone can tell me where what determines the color of the editting box (that means the box that you type into)…as it is very difficult to see with such a dark background.

Thank you.