\usepackage[dvipsnames]{xcolor}

\newcommand{\qtodo}[1]{\colorbox{orange}{\textcolor{blue}{#1}}}
\newcommand{\todo}[1]{\qtodo{\textbf{TODO:}\,#1}}
\newcommand{\qnote}[1]{\colorbox{Cerulean}{\textcolor{Sepia}{[#1]}}}
\newcommand{\note}[1]{\qnote{\textbf{NOTE:}\,#1}}
