Update on Overleaf.

presentation/modules/motivation.tex

@@ -65,6 +65,7 @@ with Differentiable Monte Carlo Raytracing [\cite{ACM:inverse_rendering}]\\
         \end{itemize}
         \pause{}
         \vspace{15mm}
+        \footnotesize
         Image source: Auth0, \href{https://auth0.com/blog/captcha-can-ruin-your-ux-here-s-how-to-use-it-right/}{CAPTCHA Can Ruin Your UX. Here’s How to Use it Right}
     \end{minipage}
     \begin{minipage}{0.5\linewidth}