diff --git a/latex/lectures/preamble.tex b/latex/lectures/preamble.tex
index 95ec7a6..18b9cff 100644
--- a/latex/lectures/preamble.tex
+++ b/latex/lectures/preamble.tex
@@ -30,8 +30,14 @@
 
 \usepackage[skins]{tcolorbox}
 
+% inline highlighting of code
 \newcommand{\hilightchar}[1]{\colorbox{yellow!75}{\makebox[0pt]{\strut{#1}}}}
-\newcommand{\hilight}[1]{\colorbox{yellow!75}{#1}}
+\newcommand{\hilight}[1]{\hspace{-1\fboxsep}\colorbox{yellow!75}{#1}}
+
+% uses the same spacing as \hilight, but does no highlighting.  Use on the
+% original code when using incremental highlighting.
+\newcommand{\nohilight}[1]{\hspace{-1\fboxsep}{\fboxrule0pt\fbox{#1}}}
+
 \newcommand{\error}[1]{\colorbox{red!75}{#1}}
 
 \tcbset{enhanced,boxsep=0pt,top=6pt,bottom=6pt,left=8pt,right=0pt,drop fuzzy shadow}
@@ -167,6 +173,16 @@
   \vspace{-0.75\baselineskip}
 }
 
+% command for figures that fit the page width
+\newcommand{\fittedfig}[1] {
+  \begin{figure}[H]
+    \begin{center}
+      \resizebox{\textwidth}{!}{\includegraphics[draft=false]{#1}}
+		\vspace{-25pt}
+    \end{center}
+  \end{figure}
+}
+
 % suppress section numbers
 \setcounter{secnumdepth}{-2}