dibujo decoración de serpiente en una caja tikz

Question

Estoy intentando dibujar algunas decoraciones de serpientes en una caja usando tikzla biblioteca, pero no pude lograr lo que quiero. Por qué hay una desalineación entre las marcas reales y las serpientes. Estoy usando el siguiente código para esto.

\documentclass[a4paper]{article}
\usepackage{tikz}
\usetikzlibrary{shapes}
\usetikzlibrary{decorations.pathmorphing, shapes, arrows, shadows, positioning}

\newcommand{\tikzmark}[2]{%
 \tikz[overlay,remember picture] \node[text=black,
       inner sep=2pt] (#1) {#2};}

 \begin{document}

 \begin{figure}[ht]
 \centering
 \tikzstyle{box}=[draw, fill=pink!10, text centered, drop shadow]
 \begin{tikzpicture}[overlay, remember picture]
 \node (main) [box, minimum height=20em, minimum width=10em,align=left] 
 {
  \tikzmark{a}{}xxxxxxxx\tikzmark{b}{}\\
  \tikzmark{c}{}xxxxxxxx\tikzmark{d}{}\\
 };

 \draw [-,decorate,decoration=snake] (a.center) -- (b.center);
 \draw [-,decorate,decoration=snake] (c.center) -- (d.center);
 \end{tikzpicture}
 \end{figure}
 \end{document}

Answer 1

Quizás tengas que ajustar la línea base en

\newcommand{\tikzmark}[2]{%
 \tikz[baseline=-0.5ex,overlay,remember picture] \node[text=black,
       inner sep=2pt] (#1) {#2};}

Llegar

\documentclass[a4paper]{article}
\usepackage{tikz}
\usetikzlibrary{shapes}
\usetikzlibrary{decorations.pathmorphing, shapes, arrows, shadows, positioning}

\newcommand{\tikzmark}[2]{%
 \tikz[baseline=-0.5ex,overlay,remember picture] \node[text=black,
       inner sep=2pt] (#1) {#2};}

 \begin{document}

 \begin{figure}[ht]
 \centering
 \tikzstyle{box}=[draw, fill=pink!10, text centered, drop shadow]
 \begin{tikzpicture}[overlay, remember picture]
 \node (main) [box, minimum height=20em, minimum width=10em,align=left]
 {
  \tikzmark{a}{}xxxxxxxx\tikzmark{b}{}\\
  \tikzmark{c}{}xxxxxxxx\tikzmark{d}{}\\
 };

 \draw [-,decorate,decoration=snake] (a.center) -- (b.center);
 \draw [-,decorate,decoration=snake] (c.center) -- (d.center);
 \end{tikzpicture}
 \end{figure}
 \end{document}