Here are the Code examples of of this chapter. You can compile them online right on this web page by pressing the Typeset / Compile button. You can also edit them for testing, and compile again.
For a better view with the online compiler, I sometimes use \documentclass[border=10pt]{standalone} instead of \documentclass{article}. Instead of having a big letter/A4 page, the standalone class crops the paper to see just the visible text without an empty rest of a page.
Any question about a code example? Post it on LaTeX.org, I will answer. As forum admin I read every single question there. (profile link).
\documentclass{article}
\usepackage{background}
\usepackage{blindtext}
\backgroundsetup{scale = 1, angle = 0, opacity = 0.2,
contents = {\includegraphics[width = \paperwidth,
height = \paperheight, keepaspectratio]
{/usr/local/texlive/2021/texmf-dist/doc/latex/l2picfaq/ctanlion.pdf}}}
% Adjust filename and path to match your own image
\begin{document}
\Blinddocument
\end{document}
\documentclass{article}
\usepackage{blindtext}
\usepackage{background}
\usetikzlibrary{calc}
\backgroundsetup{angle = 0, scale = 1, vshift = -2ex,
contents = {\tikz[overlay, remember picture]
\draw [rounded corners = 20pt, line width = 1pt,
color = blue, fill = yellow!20, double = blue!10]
($(current page.north west)+(1cm,-1cm)$)
rectangle ($(current page.south east)+(-1,1)$);}}
\pagestyle{empty}
\begin{document}
\Blinddocument
\end{document}
\documentclass{article}
\usepackage{blindtext}
\usepackage{background}
\backgroundsetup{placement = top, angle = 0,
scale = 4, color = blue!80,vshift = -0ex,
contents = {--\thepage--}}
\pagestyle{empty}
\begin{document}
\Blinddocument
\end{document}
\documentclass[paper=a6,landscape,fontsize=30pt]{scrartcl}
\areaset{0.9\paperwidth}{0.68\paperheight}
\pagestyle{empty}
\usepackage[T1]{fontenc}
\usepackage{calligra}
\usepackage{pgfornament}
\usetikzlibrary{calc}
\begin{document}
\centering
\begin{tikzpicture}[
every node/.style = {inner sep = 0pt},
pgfornamentstyle/.style = {color = green!50!black,
fill = green!80!black}]
\node [text width = 8cm, outer sep = 1.2cm, text centered,
color = red!90!black, font = \calligra] (Greeting)
{ Happy Birthday,\\Dear Mom!\\[-1ex]
\pgfornament[color = red!90!black, width = 2.5cm]{72}};
\foreach \corner/\sym in {north west/none, north east/v,
south west/h, south east/c} {
\node [anchor = \corner] (\corner) at (Greeting.\corner)
{\pgfornament[width = 2cm, symmetry = \sym]{63}};}
\path (north west) -- (south west)
node [midway, anchor = east]
{\pgfornament[height = 2cm]{9}}
(north east) -- (south east)
node [midway, anchor = west]
{\pgfornament[height = 2cm, symmetry = v]{9}};
\pgfornamenthline{north west}{north east}{north}{87}
\pgfornamenthline{south west}{south east}{south}{87}
\end{tikzpicture}
\end{document}
\documentclass[a7paper,fontsize=19pt]{scrartcl}
\usepackage[landscape,margin=1.2cm]{geometry}
\usepackage{pgfornament}
\usepackage{background}
\usepackage{lipsum}
\usepackage{microtype}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\backgroundsetup{angle=0, scale=1, opacity=1, color=black!60,
contents={\begin{tikzpicture}[remember picture, overlay]
\foreach \pos/\sym in {north west/none, north east/v,
south west/h, south east/c} {
\node[anchor=\pos] at (current page.\pos)
{\pgfornament[width=2cm,symmetry=\sym]{63}};}
\end{tikzpicture}}}
\begin{document}
\noindent\lipsum
\end{document}
\documentclass{scrartcl}
\usepackage[automark]{scrlayer-scrpage}
\usepackage[english]{babel}
\usepackage{blindtext}
\PassOptionsToPackage{svgnames}{xcolor}
\usepackage{tikz}
\newcommand{\tikzhead}[1]{%
\begin{tikzpicture}[remember picture,overlay]
\node[yshift=-2cm] at (current page.north west)
{\begin{tikzpicture}[remember picture, overlay]
\path[draw=none, fill=LightSkyBlue] (0,0) rectangle
(\paperwidth,2cm);
\node[anchor=east,xshift=.9\paperwidth,rectangle,
rounded corners=15pt,inner sep=11pt,
fill=MidnightBlue,font=\sffamily\bfseries]
{\color{white}#1};
\end{tikzpicture}
};
\end{tikzpicture}}
\clearscrheadings
\ihead{\tikzhead{\headmark}}
\pagestyle{scrheadings}
\begin{document}
\tableofcontents
\clearpage
\blinddocument
\end{document}
\documentclass[DIV14]{scrartcl}
%\usepackage[margin = 2.5cm, a4paper]{geometry}
\usepackage{tikz}
\usetikzlibrary{calendar,positioning}
\newcommand{\calyear}{2016}
\newcommand{\mon}[1]{\calendar[dates = \calyear-#1-01
to \calyear-#1-last] if (Sunday) [red];}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}[every calendar/.style = {
month label above centered,
month text = {\Large\textsc{\%mt}},
week list,
}]
\matrix (Calendar) [column sep = 4em, row sep = 3em] {
\mon{01} & \mon{02} & \mon{03} \\
\mon{04} & \mon{05} & \mon{06} \\
\mon{07} & \mon{08} & \mon{09} \\
\mon{10} & \mon{11} & \mon{12} \\ };
\node [above = 1cm of Calendar, font = \Huge] {\calyear};
\end{tikzpicture}
\end{document}
\documentclass[a4paper]{scrartcl}
\usepackage{tikz}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}[remember picture,overlay]
\draw[step=0.5cm, color=gray]
(current page.south west) grid (current page.north east);
\end{tikzpicture}
\end{document}
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