Colored Alert Boxes in LaTeX

tcolorbox.tex

% Pick a nice color
\usepackage{xcolor}
\definecolor{pastelpurple}{RGB}{221,199,255}

% For Alert Boxes
% \usepackage{awesomebox}
\usepackage[most]{tcolorbox}

% textmarker style from colorbox doc
\tcbset{textmarker/.style={%
        enhanced,
        parbox=false,boxrule=0mm,boxsep=0mm,arc=0mm,
        outer arc=0mm,left=4mm,right=3mm,top=7pt,bottom=7pt,
        toptitle=1mm,bottomtitle=1mm,oversize}}


% define new colorboxes
\newtcolorbox{definition_box}{textmarker,
    borderline west={6pt}{0pt}{pastelpurple},
    colback=pastelpurple!10!white,text width=\columnwidth}

% Wrap it around a new command
\newcommand{\definition}[1]{
  \begin{definition_box} \textbf{Definition\quad}\newline 
    #1 
  \end{definition_box}
}

% Example usage:
\definition{Assign a fixed, constant number of work tiles to each thread. Resultant work items from each work tile are processed sequentially within the thread.}