\Preamble{xhtml}

\Configure{tableofcontents*}{chapter,section,subsection}

\Css{* :not(img) {
    max-width: 100\%;
    width: 50vw; 
    height: auto;
    margin: 0 auto;
}}

\Css{* {
    font-size: 1vw;
}}

\Css{.ecrm-0500 { 
    font-size: 70\%;
    font-style: italic; 
    color: gray;
    -webkit-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}}

\Css{.ecrm-0500:after {
    content:" ";
    white-space: pre;
    -webkit-user-select: none;
    -moz-user-select: none;
    -o-user-select: none;
    user-select: none;
}}

\begin{document}
\EndPreamble