[Tex/LaTex] How to make this watermark

Question

I'm going to write a lecture note . I'd like to make create a watermark like this but i don't know how to do it. Can you help me to draw this watermark?

Answer 1

Welcome! You can do that e.g. with eso-pic and tikz. The distance to this watermark to the text is specified in ([xshift=-1ex]current page text area.west).

\documentclass{article}
\usepackage{tikzpagenodes}
\usepackage{eso-pic}
\usepackage{lipsum}%<- only to add some text
\AddToShipoutPicture{\begin{tikzpicture}[overlay,remember picture]
 \node[anchor=south,rotate=90,pink,font=\sffamily\Huge] 
 (AE) at ([xshift=-1ex]current page text area.west){Albert Einstein};
 \draw[very thick,pink] (AE.east) -- ++ (0,4)
   (AE.west) -- ++ (0,-4);
\end{tikzpicture}}
\begin{document}
\section{Blub}

\lipsum[1-10]
\end{document}

For different "watermarks" on even vs. odd pages, you can use

\documentclass{article}
\usepackage{tikzpagenodes}
\usepackage{eso-pic}
\usepackage{lipsum}%<- only to add some text
\AddToShipoutPicture{\begin{tikzpicture}[overlay,remember picture]
\ifodd\value{page}
 \node[anchor=south,rotate=90,pink,font=\sffamily\Huge] 
 (AE) at ([xshift=-1em]current page text area.west){Albert Einstein};
 \draw[very thick,pink] (AE.east) -- ++ (0,4)
   (AE.west) -- ++ (0,-4);
\else
 \node[anchor=south,rotate=-90,pink,font=\sffamily\Huge] 
 (CFG) at ([xshift=1em]current page text area.east){Carl Friedrich Gauss};
 \draw[very thick,pink] (CFG.west) -- ++ (0,4)
   (CFG.east) -- ++ (0,-4);
\fi   
\end{tikzpicture}}
\begin{document}
\section{Blub}

\lipsum[1-20]
\end{document}