In this MWE, that involves a very attractive chapter heading style found here, and also an elegant chapter thumb setting found here, developed by Mr. Gonzalo Medina, I wanted to get the chapter name, section names and subsection names to show up in a box along the edge of pages like this:
and the page headers (except on the chapter title page) to look like this (with the ocre colored box):
\documentclass[11pt,fleqn]{book}
\usepackage[english]{babel}
\usepackage{lipsum}
\usepackage{xcolor}
\usepackage{tikz}
\usepackage{mathtools,amsfonts,amssymb,amsthm}
\usepackage[most]{tcolorbox}
\definecolor{ocre}{RGB}{52,177,201}
\definecolor{ultramarine}{RGB}{0,45,97}
\definecolor{mybluei}{RGB}{0,173,239}
\definecolor{myblueii}{RGB}{63,200,244}
\definecolor{myblueiii}{RGB}{199,234,253}
\usepackage{fourier}
\usepackage[explicit]{titlesec}
\renewcommand\thechapter{\arabic{chapter}}
\newcommand\chapnumfont{%
\fontsize{380}{130}\color{myblueii}\selectfont%
}
\newcommand\chapnamefont{%
\normalfont\color{white}\scshape\small\bfseries
}
\titleformat{\chapter}
{\normalfont\huge\filleft}
{}
{0pt}
{\stepcounter{chapshift}%
\begin{tikzpicture}[remember picture,overlay]
\fill[myblueiii]
(current page.north west) rectangle ([yshift=-13cm]current page.north east);
\node[
fill=mybluei,
text width=2\paperwidth,
rounded corners=6cm,
text depth=18cm,
anchor=center,
inner sep=0pt] at (current page.north east) (chaptop)
{\thechapter};%
\node[
anchor=south east,
inner sep=0pt,
outer sep=0pt] (chapnum) at ([xshift=-20pt]chaptop.south)
{\chapnumfont\thechapter};
\node[
anchor=south,
inner sep=0pt] (chapname) at ([yshift=2pt]chapnum.south)
{};
\node[
anchor=north east,
align=right,
inner xsep=0pt] at ([yshift=-0.5cm]chapname.east|-chapnum.south)
{\parbox{.7\textwidth}{\raggedleft#1}};
\end{tikzpicture}%
}
\titleformat{name=\chapter,numberless}
{\normalfont\huge\filleft}
{}
{0pt}
{\begin{tikzpicture}[remember picture,overlay]
\fill[myblueiii]
(current page.north west) rectangle ([yshift=-13cm]current page.north east);
\node[
fill=mybluei,
text width=2\paperwidth,
rounded corners=6cm,
text depth=18cm,
anchor=center,
inner sep=0pt] at (current page.north east) (chaptop)
{};%
\node[
anchor=south east,minimum width=2in,
inner sep=0pt,
outer sep=0pt] (chapnum) at ([xshift=-20pt]chaptop.south)
{};
\node[
anchor=south,
inner sep=0pt] (chapname) at ([yshift=2pt]chapnum.south)
{};
\node[
anchor=north east,
align=right,
inner xsep=0pt] at ([yshift=-0.5cm]chapname.east|-chapnum.south)
{\parbox{.7\textwidth}{\raggedleft#1}};
\end{tikzpicture}%
}
\titlespacing*{\chapter}{0pt}{0pt}{3.5in}
\titlespacing*{name=\chapter,numberless}{0pt}{0pt}{3.5in}
\usetikzlibrary{calc}
\pagestyle{plain}
\newcounter{chapshift}
\addtocounter{chapshift}{-1}
\newcommand\BoxColor{myblueii}
\def\subsectiontitle{}
\renewcommand{\sectionmark}[1]{\markright{\sffamily\normalsize#1}{}}
\renewcommand{\subsectionmark}[1]{\def\subsectiontitle{#1}}
\usepackage{etoolbox,fancyhdr}
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{\sffamily\normalsize\bfseries \ #1}{}}
\renewcommand{\sectionmark}[1]{\markright{\sffamily\normalsize\thesection\hspace{5pt}#1}{}}
\fancyhf{} \fancyhead[LE,RO]{\sffamily\normalsize\thepage}
\fancyhead[LO]{\textcolor{mybluei} \rightmark%
\begin{tikzpicture}[overlay,remember picture]
\node[fill=\BoxColor,inner sep=-1pt,rectangle,text width=1cm,
text height=28cm,align=center,anchor=north east]
at ($ (current page.north east) $)
{\rotatebox{90}{\parbox{18cm}{%
\centering\textcolor{white}{\bfseries\scshape\thechapter.\leftmark \hspace{2cm}\rightmark\hspace{2cm}\thesubsection~\subsectiontitle}}}};
\end{tikzpicture}}
\fancyhead[RE]{\textcolor{mybluei}\leftmark%
\begin{tikzpicture}[overlay,remember picture]
\node[fill=\BoxColor,inner sep=0pt,rectangle,text width=1cm,
text height=28cm,align=center,anchor=north west]
at ($ (current page.north west) $)
{\rotatebox{90}{\parbox{18cm}{%
\centering\textcolor{white}{\bfseries\scshape\thechapter.\leftmark \hspace{2cm}\rightmark\hspace{2cm}\thesubsection~\subsectiontitle}}}};
\end{tikzpicture}}
\renewcommand{\headrulewidth}{.5pt}
\addtolength{\headheight}{2.5pt}
\newcommand{\footrulecolor}[1]{\patchcmd{\footrule}{\hrule}{\color{#1}\hrule}{}{}}
\renewcommand{\headrulewidth}{.5pt}
\addtolength{\headheight}{2.5pt}
\renewcommand{\footrulewidth}{.5pt}
\fancyfoot[LE,RO]{\footnotesize\bfseries\itshape Foot 1}
\fancyfoot[C]{\footnotesize\bfseries Foot 2}
\fancyfoot[RE,LO]{\footnotesize\bfseries\itshape Foot 3}
\fancypagestyle{plain}{%
\fancyhf{}%
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
}
\makeatletter
\renewcommand{\cleardoublepage}{
\clearpage\ifodd\c@page\else
\hbox{}
\vspace*{\fill}
\thispagestyle{empty}
\newpage
\fi}
\makeatother
\begin{document}
\chapter{This is how it all began}
\section{Introduction}
\lipsum[1-3]
\subsection{Sub Introduction}
\lipsum[1-3]
\chapter{This is how it all ended}
\section{Time to say "Goodbye"}
\lipsum
\end{document}
