documentclass[oneside]{book}

    usepackage{color, xcolor}


    newcommand{mysection}[2]{
        setcounter{section}{#1}
        setcounter{section}{0}
        chapter*{#2}
        addcontentsline{toc}{section}
    {protectnumberline{hspace{-1.15cm}%
                       colorbox{blue!50}{color{blue}stringparbox[c][.72em]{1em}
                       {strutprotect}}%
                       hspace{1em}bfseriessffamily MakeUppercase{#2}protect}}
    }




    begin{document}

    tableofcontents

    frontmatter
    mysection{1}{Introduction}
    mysection{0}{Acknowledgments}
    mainmatter


    end{document}