my_colored_theorems.sty

% Defines colored theorems, for technical reports
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{my_colored_theorems}
\usepackage{color}
\usepackage{thmtools}
\usepackage{mytheorems}

\declaretheorem[name=Definition,shaded={bgcolor=YellowGreen}]{definition}
\declaretheorem[name=Proposition,sibling=definition,shaded={bgcolor=Yellow}]{proposition}
\declaretheorem[name=Lemma,sibling=definition,shaded={bgcolor=YellowOrange!50}]{lemma}
\declaretheorem[name=Theorem,sibling=definition,shaded={bgcolor=Melon}]{theorem}
\declaretheorem[name=Corollary,sibling=definition,shaded={bgcolor=Cyan!30}]{corollary}
\declaretheorem[name=Remark,sibling=definition]{remark}
\declaretheorem[name=Assumption,sibling=definition,shaded={bgcolor=Red!40}]{assumption}