Installing Texmaker

http://www.xm1math.net/texmaker/index.html

• Linux

$ sudo apt-get install texlive-full texmaker

To see the result press F6 to convert  and then press blue arrow next to "View PDF".

•   Windows

http://www.howtotex.com/howto/installing-latex-on-windows/

• Gray background with white letters

\documentclass{article}
\usepackage{xcolor}

\pagecolor[rgb]{0.15,0.15,0.15}
\color[rgb]{1,1,1}
\begin{document}

Hello \clearpage
World

\end{document}