First commit!

main.tex

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+% !TEX TS-program = xelatex
+% !TEX encoding = UTF-8 Unicode
+
+\documentclass[11pt]{article}
+
+\usepackage{calc}
+\usepackage{tikz}
+\usetikzlibrary{calc,positioning,backgrounds,matrix}
+
+\newlength\margin{}
+\setlength\margin{1cm}
+
+\usepackage[margin=\margin, noheadfoot, a4paper]{geometry}
+
+\newlength\sidewidth{}
+\setlength\sidewidth{0.3\paperwidth-\margin}
+
+\newlength\mainwidth{}
+\setlength\mainwidth{\paperwidth-4\margin-\sidewidth}
+
+\begin{document}
+Sample text
+\end{document}