my updates and my followers updates are WHITE?

Hello.

I'm having a problem that is irritating me a lot. The problem is that my startpage,
where I can see all my followers tweets, and also my own ones, are WHITE
(see the picture I added in this message)

I can see there username, and the text at the bottom where the time the post was added stands, but the message is white so I have to mark over the text with the mouse to see what it says.

Is there any way I can fix this so the twitter messages also can be BLACK like the rest of all text on my twitter?

Big thanks.
Sanna.