Node verbinden trotz outer sep

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\documentclass[tikz,border=5pt]{standalone}
\usetikzlibrary{shapes, arrows,snakes,backgrounds,fit,positioning}
\begin{document}
\tikzset{block/.style ={ rectangle, draw, text width=19em, text centered, rounded corners, minimum height=2em,fill=blue!30}}
\tikzset{blockBig/.style ={rectangle, draw, text width=19em, text centered, rounded corners, minimum height=2em, outer sep=0.5cm,fill=blue!30,node distance=0.0cm}}
\tikzset{scope/.style ={rectangle, draw, text width=19em, text centered, rounded corners, minimum height=2em, inner sep=0.5cm,fill=blue!30}}
\tikzset{dottedline/.style ={draw,dotted, very thick}}
\tikzset{line/.style ={draw, very thick}}
     \begin{tikzpicture}[node distance = 0.5cm, auto]
         \node [blockBig,](anwendung) {Benutzer Anwendungen};
         \node [block,text width=12em, xshift=1cm,below=of anwendung] (glibc) {C Standard Bibliothek (glibc)};
         \node [block, yshift=-1cm,xshift=-1cm,below=of glibc] (syscall) {Systemaufruf Schnittstelle};
         \node [block, below=of syscall] (kernel) {Kernel};
         \node [block, below=of kernel] (code) {Architektur abhängiger Kernel Code};
         \begin{scope}[on background layer]
         \node [scope](eins)[
         fit=(anwendung) (glibc) (syscall) (kernel) (code),
         label={[anchor=south,shade=none]below:Hardware Plattform},
         yshift=-2.3em,fill=green!30,
         draw=black] (hardware) {};
         \end{scope}
         \begin{scope}[on background layer]
         \node [scope](zwei)[
         fit=(syscall) (kernel) (code),
         fill=blue!10,
         draw=black] (kernelspace) {};
        \end{scope}
        \draw[dottedline] (-5,-2.9) -- (5,-2.9);
%        \draw[line, red] (anwendung.south) -- (anwendung|-glibc.north);
%        \draw[line, red] (anwendung.200) -- (anwendung.200|-syscall.north);
        \draw[line] (syscall.south) -- (kernel.north);
        \draw[line] (kernel.south) -- (code.north);
        \draw[line] (glibc.209) -- (glibc.209|-syscall.north);
\begin{scope}[on background layer]
\draw[line, red] (anwendung.center) -- (anwendung|-glibc.north);
 
 
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