A4 margins for the Chi-Ext LaTeX template - this keeps the page margins the same (to about 2mm accuracy) as the original template has for the US Letter paper size

chi-ext-a4.tex

% Note the a4paper - patch start (line 33, cbhi-ext.cls)
\LoadClass[10pt,a4paper,landscape]{article}[1996/10/31]

% -----------------------------------------------------------------------------
% Set paper and margin sizes

% Original freedom margins and sizes
% \setlength{\paperheight}{8.5in}
% \setlength{\paperwidth}{11in}

% \setlength{\textwidth}{7.25in}
% \setlength{\textheight}{6in}

% \setlength{\oddsidemargin}{1.5in}
% \setlength{\topmargin}{0.25in}

% \setlength{\columnsep}{0.5in}

% \setlength{\voffset}{-0.2in}

% \setlength{\parindent}{0pt}
% \setlength{\footskip}{0.5in}

% \setlength{\marginparsep}{15pt}
% \setlength{\marginparwidth}{1.8in}

% \setlength{\itemsep}{0pt}
% \setlength{\parsep}{0pt}
% \setlength{\topsep}{0pt}
% \setlength{\parskip}{9pt}

\setlength{\paperheight}{210mm}
\setlength{\paperwidth}{297mm}

\setlength{\textwidth}{200mm}
\setlength{\textheight}{145mm}

\setlength{\oddsidemargin}{38mm}
\setlength{\topmargin}{6.25mm}

\setlength{\columnsep}{12.5mm}

\setlength{\voffset}{-5mm}

\setlength{\parindent}{0pt}
\setlength{\footskip}{12.5mm}

\setlength{\marginparsep}{15pt}
\setlength{\marginparwidth}{45mm}

\setlength{\itemsep}{0pt}
\setlength{\parsep}{0pt}
\setlength{\topsep}{0pt}
\setlength{\parskip}{9pt}
% patch end
% -----------------------------------------------------------------------------
% Set paper columns and avoid justifying text, according to CHI's MS Word template