# Formatting subsections and chapters in tufte-book

Sorry. I am new at this and it is my first time asking a question. I was reading this posting:

how to change chapter/section style in tufte-book?

How does one also get the subsections to change to the same colors as the sections as in the top image?

Also, how does one make the chapter have a similar style to the section headings?

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Welcome to TeX.sx! There is no need to add a signature or thanks to the post. Simply upvote answers to show your appreciation for any help. –  Peter Jansson Jan 30 '13 at 22:12
Don't be sorry, it's a very reasonable question :) Welcome! –  cmhughes Jan 30 '13 at 22:33
Thank you! I look forward to participating. This resource so far has been tremendously helpful. –  RobertD Jan 30 '13 at 22:36

The tufte documentclass loads the titlesec package, so we have immediate access to all of its excellent features.

Indeed, tufte-common.def contains declarations for each of chapter, section and subsection using the titleformat. We can tweak them to give us what we want- in your case, using colorbox to help us. A complete MWE is at the end, but here's the bit that we need for your requirements:

% chapter format
\titleformat{\chapter}%
{\huge\rmfamily\itshape\color{red}}% format applied to label+text
{\llap{\colorbox{red}{\parbox{1.5cm}{\hfill\itshape\huge\color{white}\thechapter}}}}% label
{2pt}% horizontal separation between label and title body
{}% before the title body
[]% after the title body


Note that I've used \llap to push the number into the left margin- you can tweak the horizontal separator as you wish. The tweaks for section and subsection are very similar.

The only other subtlety is that I have used

\setcounter{secnumdepth}{2}


so that we get numbers for all of the section headings (the default value is -1 which turns all the numbers off).

\documentclass[a4paper,twoside]{tufte-book}

\usepackage{xcolor} % for colour
\usepackage{lipsum} % just for sample text

% add numbers to chapters, sections, subsections
\setcounter{secnumdepth}{2}

% chapter format
\titleformat{\chapter}%
{\huge\rmfamily\itshape\color{red}}% format applied to label+text
{\llap{\colorbox{red}{\parbox{1.5cm}{\hfill\itshape\huge\color{white}\thechapter}}}}% label
{2pt}% horizontal separation between label and title body
{}% before the title body
[]% after the title body

% section format
\titleformat{\section}%
{\normalfont\Large\itshape\color{orange}}% format applied to label+text
{\llap{\colorbox{orange}{\parbox{1.5cm}{\hfill\color{white}\thesection}}}}% label
{1em}% horizontal separation between label and title body
{}% before the title body
[]% after the title body

% subsection format
\titleformat{\subsection}%
{\normalfont\large\itshape\color{blue}}% format applied to label+text
{\llap{\colorbox{blue}{\parbox{1.5cm}{\hfill\color{white}\thesubsection}}}}% label
{1em}% horizontal separation between label and title body
{}% before the title body
[]% after the title body

\begin{document}

\chapter{Chapter}
\lipsum[1]
\section{Section}
\lipsum[1]
\subsection{Sub section}
\lipsum[1]

\end{document}

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Thank you! This looks great. –  RobertD Jan 31 '13 at 6:03