how to change the Inkscape default export color from yellow to white?

Hi This might be a very stupid ques开发者_Python百科tion. I am using export of 'Inkscape' to convert the svg file to png. As I am using the transparent backgroung the color of background is automatically yellow. I want to change this default colour to white

It was a mistake. as the background was transparent. It depends which image viewer are you using. While displaying everybody has its own color. In general, at linux i found it to be yellow and in windows white.

I am sorry for asking a stupid question.