first Stack post :D
I see there's a lot on topic already, but I'm still struggling with Tikz picture margins in LaTeX.
Code (PDFLaTeX):
\documentclass{amsart}
\usepackage{tikz}
% Custom Commands
%buffer window around unit (total window is 1+2*twindow)
\newcommand{\twindow}{0.2}
\begin{document}
\title{Pandemic Legacy: Season 1\\Salt Report Zero}
\author{Noriko ``Dr. Salt'' Shio}
\maketitle
% Tanith Lee quote
\emph{Narasen, the leopard queen of Merh, stood at her window and watched Lady~Plague walking about in the city.}\\{\flushright -\textsc{Tanith Lee}, Tales From The Flat Earth: Death's Master
\begin{tikzpicture}[scale=10.5]
\draw(-\twindow,-\twindow)rectangle(1+\twindow,1+\twindow);
\end{tikzpicture}
\end{document}
Result:
1) Topic question is: Simplest way to horizontally center this tikzpicture square?
Bonus Question:
2) can I control the text margin independently from the picture margin?

\centerline, i.e.\centerline{\begin{tikzpicture}[scale=10.5] \draw(-\twindow,-\twindow)rectangle(1+\twindow,1+\twindow); \end{tikzpicture}}, but please don't tell egreg that I told you that ;-) – Jul 07 '18 at 04:14{\flushright ...scope ;-), probably with a\par}(to avoid surprises...) – Rmano Jul 07 '18 at 09:44