# chapter style with tcolorbox?

Is it possible to customize chapter style like below picture by using tcolorbox package? if not, can you show me which package could generate that such style? Thanks

• we can ignore the background picture on the left handsite. Jul 8, 2015 at 14:18
• What have you got so far in terms of code? Note that without a minimal example document, any solution is likely to not work for your document because we just don't know anything about it. So the answer to you first question is 'Yes'. The bonus answer is: 'and show us what you've tried if you get stuck implementing it'.
– cfr
Jul 8, 2015 at 14:45

Here's one possibility using tcolorbox and titlesec. An image for an unnumbered chapter:

An image for a numbered chapter:

The code:

\documentclass{book}
\usepackage[explicit]{titlesec}
\usepackage[many]{tcolorbox}
\usepackage{lmodern}
\usepackage{lipsum}

\definecolor{titlebgdark}{RGB}{0,163,243}
\definecolor{titlebglight}{RGB}{191,233,251}

\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}
{}
{20pt}
{%
\begin{tcolorbox}[
enhanced,
colback=titlebgdark,
boxrule=0.25cm,
colframe=titlebglight,
arc=0pt,
outer arc=0pt,
leftrule=0pt,
rightrule=0pt,
fontupper=\color{white}\sffamily\bfseries\huge,
enlarge left by=-1in-\hoffset-\oddsidemargin,
enlarge right by=-\paperwidth+1in+\hoffset+\oddsidemargin+\textwidth,
width=\paperwidth,
left=1in+\hoffset+\oddsidemargin,
right=\paperwidth-1in-\hoffset-\oddsidemargin-\textwidth,
top=0.6cm,
bottom=0.6cm,
overlay={
\node[
fill=titlebgdark,
draw=titlebglight,
line width=0.15cm,
inner sep=0pt,
text width=1.7cm,
minimum height=1.7cm,
align=center,
font=\color{white}\sffamily\bfseries\fontsize{30}{36}\selectfont
]
(chapname)
at ([xshift=-4cm]frame.north east)
{\thechapter};
\node[font=\small,anchor=south,inner sep=2pt] at (chapname.north)
{\MakeUppercase\chaptertitlename};  % if using amsbook, this should be \chaptername
}
]
#1
\end{tcolorbox}%
}
\titleformat{name=\chapter,numberless}[display]
{\normalfont\huge\bfseries}
{}
{20pt}
{%
\begin{tcolorbox}[
enhanced,
colback=titlebgdark,
boxrule=0.25cm,
colframe=titlebglight,
arc=0pt,
outer arc=0pt,
remember as=title,
leftrule=0pt,
rightrule=0pt,
fontupper=\color{white}\sffamily\bfseries\huge,
enlarge left by=-1in-\hoffset-\oddsidemargin,
enlarge right by=-\paperwidth+1in+\hoffset+\oddsidemargin+\textwidth,
width=\paperwidth,
left=1in+\hoffset+\oddsidemargin,
right=\paperwidth-1in-\hoffset-\oddsidemargin-\textwidth,
top=0.6cm,
bottom=0.6cm,
]
#1
\end{tcolorbox}%
}
\titlespacing*{\chapter}
{0pt}{0pt}{40pt}
\makeatother

\begin{document}

\chapter*{A test unnumbered chapter}
\lipsum[4]
\chapter{A test chapter with a long title that will span more than one line}
\lipsum[4]

\end{document}

• Thanks Gonzalo. Is it possible to put the "chapter" on the top of small box (i.e. "1") Jul 8, 2015 at 14:52
• @ĐăngKhoaNguyễnVũ You're welcome. Please see my updated answer. Jul 8, 2015 at 14:57
• Dear Gonzala, Can you tell me which code can adjust the the size of the small box (square rectangular) on the right top? and I also want to move the box to the right a little bit. How can adjust it. Pls forgive me, coz i am newbie of Tex. Jul 22, 2015 at 6:51
• Dear Gonzalo, you can refer to my question with the pic at imgur.com/9zBzJAV . If the chapter title too long so that it will close very much with the rectangular box. I would like to move it to the right a litter bit and make the number in box occupied all most the box. Many thanks for your instruction! Jul 22, 2015 at 7:23
• @ĐăngKhoaNguyễnVũ I can't reproduce the problem you mentioned. Move the number to the right changing the -4cm in (chapname) at ([xshift=-4cm]frame.north east) {\thechapter}; to a smaller value (-3cm or whatever value suits your needs). For the other resuirement, change the values in font=\color{white}\sffamily\bfseries\fontsize{30}{36}\selectfont to a bigger font size, for example font=\color{white}\sffamily\bfseries\fontsize{50}{60}\selectfont. Jul 22, 2015 at 15:56