Change the font size

src/TheCubicSystem.tex

@@ -6,6 +6,7 @@
 \usepackage{multicol}
 \usepackage{hyperref}
 \usepackage[dvipsnames]{xcolor}
+\usepackage{relsize}
 \usepackage{fontspec}
 \setmainfont{Arial}
 \graphicspath{ {./src} }
@@ -28,6 +29,7 @@
   colback=parchment
 }
 \begin{document}
+\smaller
 \begin{center}
 {\huge The Cubic System} \\
 {by William Moore}