Umgebung mit tcolorbox und amsthm, Titel in abgesetzter Box

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\documentclass{scrbook}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{xcolor}
\usepackage{tcolorbox}
\tcbuselibrary{skins,theorems,breakable}
\usepackage{varwidth}
%Theorem mit tcolorbox
\newtcbtheorem{YetAnotherTheorem}{Theorem}%
{enhanced,breakable,frame empty,interior empty,colframe=green!50!white,
coltitle=green!50!black,fonttitle=\bfseries,colbacktitle=green!15!white,
borderline={0.5mm}{0mm}{green!15!white},
borderline={0.5mm}{0mm}{green!50!white,dashed},
attach boxed title to top center={yshift=-2mm},
boxed title style={boxrule=0.4pt},varwidth boxed title}{theo}
%Theorem mit amsthm
\newtheoremstyle{defstyle}
    {}
    {}
    {
    }
    {0pt}{}{}
    {\newline}
    {\ifx\relax#3\relax
   \textcolor{blue!50!white}{\textbf{#1} #2}%
 \else
   \textbf{#3}%
 \fi}
\theoremstyle{defstyle}
\newtheorem{definition}{Definition}
\tcolorboxenvironment{definition}{enhanced jigsaw,colframe=blue,colback=blue!20!white,breakable,before skip=10pt,after skip=10pt,attach boxed title to top center={yshift=-2mm}}
\begin{document}
\begin{YetAnotherTheorem}{Mittelwertsatz f\"{u}r $n$ Variable}{mittelwertsatz_n4}%
Es sei $n\in\mathbb{N}$, $D\subseteq\mathbb{R}^n$ eine offene Menge und
 
 
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