GBAtemp presently features two themes- you can select them down the bottom left of the page, via http://gbatemp.net/misc/style?redirect=/ or in http://gbatemp.net/account/preferences One is a light theme and the other is a dark theme (far nicer for those that do not wish to get a suntan from their daily foruming). Naturally the colours are set to change with each but you can override the theme colours in your posts using the markup. However if you select dark colors or black, doubly so when you put them in a quote (#333333 is the colour in the quote below), it causes them to be very hard to read or even totally invisible to users of the dark theme. Do not worry too much about it as staff will usually fix it should it be troubling but as you probably take extra steps to change colours, fonts, sizes and such like it is hopefully not a burden. Theoretically the same could apply to users of the dark theme posting in the light one but we have not encountered that thus far.