Change to Serif font

docs/preamble.tex

@@ -3,7 +3,7 @@
 \usepackage[english]{babel}
 \usepackage[utf8]{inputenc}
 \usepackage[letterpaper,includeheadfoot, top=0.5cm, bottom=3.0cm, right=2.0cm, left=2.0cm]{geometry}
-\renewcommand{\familydefault}{\sfdefault}
+\renewcommand{\familydefault}{\rmdefault}
 
 \usepackage{graphicx}
 \usepackage{color}