Add examples to main.tex and correct errors in titlepage.tex

titlepage.tex

@@ -1,9 +1,10 @@
 \begin{titlepage}
     \begin{center}
         \includegraphics[width=\textwidth]{<TITLEPAGE_GRAPHICS_PATH>}
-        \Huge\textbf{<MAIN_TITLE> }
+        \Huge\textbf{<MAIN\_TITLE> }
         \singlespacing
         \color[HTML]{282828}\Large\textbf{<SUBTITLE>}
+    \end{center}
 
-        \vfill
+    \vfill
 \end{titlepage}