\setbeamercolor{background canvas}{bg=black}
\setbeamercolor{normal text}{fg=white}

\setbeamercolor{alerted text}{fg=gray}
\setbeamercolor{section in toc}{use=alerted text}
\setbeamercolor{box title}{use=alerted text}

\setbeamercolor{block title}{fg=gray}
\setbeamercolor{block title alerted}{fg=red}
\setbeamercolor{block title example}{use=block title}

\setbeamercolor{itemize item}{fg=darkgray}
\setbeamercolor{itemize subitem}{use=itemize item}
\setbeamercolor{itemize subsubitem}{use=itemize item}

\setbeamercolor{enumerate item}{fg=gray}
\setbeamercolor{enumerate subitem}{use=enumerate item}
\setbeamercolor{enumerate subsubitem}{use=enumerate item}