[closed] acronyms - Wie erzeuge ich einen Rahmen bzw. eine Caption?

\documentclass[12pt,twoside]{report}
\usepackage[a4paper, top=25mm, bottom=27mm, left=35mm, right=30mm, bindingoffset=0mm]{geometry}


\usepackage[hyperref = true, only-used = false, list-style = longtable]{acro}

\usepackage{amsmath}
\usepackage{enumitem} %allows itemize environment adjustments
\usepackage{multicol}


\newlist{acronyms}{description}{1}
\setlist[acronyms]{
labelwidth = 4.5em,
leftmargin = 5em,
noitemsep,
itemindent = 0pt}
\DeclareAcroListStyle{mystyle}{list}{ list = acronyms }
\acsetup{ list-style = mystyle }

%%% Nomenclature Definitions

%%% Acronyms
\DeclareAcronym{ADC}{
    short = ADC,
    long  = Analogue to Digital Converter,
    class = abbrev}
\DeclareAcronym{ASIC}{
    short = ASIC,
    long  = Application Specific Integrated Circuit,
    class = abbrev}
\DeclareAcronym{BLDC}{
    short = BLDC,
    long  = BrushLess Direct Current,
    class = abbrev}
\DeclareAcronym{CWT}{
    short = CWT,
    long  = Continuous Wavelet Transform,
    class = abbrev}
\DeclareAcronym{DAC}{
    short = DAC,
    long  = Digital to Analogue Converter,
    class = abbrev}
\DeclareAcronym{DFT}{
    short = DFT,
    long  = Discrete Fourier Transform,
    class = abbrev}
\DeclareAcronym{DSP}{
    short = DSP,
    long  = Digital Signal Processing / Processor,
    class = abbrev}
\DeclareAcronym{DWT}{
    short = DWT,
    long  = Discrete Wavelet Transform,
    class = abbrev}
\DeclareAcronym{EEMD}{
    short = EEMD,
    long  = Ensemble Empirical Mode Decomposition,
    class = abbrev}
\DeclareAcronym{EMD}{
    short = EMD,
    long  = Empirical Mode Decomposition,
    class = abbrev}

%%% Symbols

%% Regular Alphabet
\DeclareAcronym{b}{
    short = \ensuremath{b},
    long  = Dyadic Translation,
    sort  = 0002,
    class = nomencl}
\DeclareAcronym{c}{
    short = \ensuremath{c},
    long  = Speed of Sound,
    sort  = 0003,
    class = nomencl}
\DeclareAcronym{EffElas}{
    short = \ensuremath{E},
    long  = Effective Elastic Modulus,
    sort  = 0005,
    class = nomencl}
\DeclareAcronym{g}{
    short = \ensuremath{g},
    long  = High-Pass Filter (Wavelet Transform),
    sort  = 0007,
    class = nomencl}




\begin{document}



    Hier soll \ac{zb} stehen. Aber das geht bestimmt auch mit anderen Sachen wie
    \ac{etc} oder \ac{bla} \ac{kannirgendetwas}.

    \printacronyms


    \chapter*{Nomenclature}
    \section*{Abbreviations}
    \begin{flushleft}
        \begin{footnotesize}
            \begin{multicols}{2}

                \printacronyms[include-classes=abbrev, heading=none]
            \end{multicols}
        \end{footnotesize}
    \end{flushleft}

    \newpage
    \section*{Characters \& Symbols}
    \begin{flushleft}
        \begin{footnotesize}
            \begin{multicols}{2}
                \printacronyms[include-classes=nomencl, heading=none]

            \end{multicols}
        \end{footnotesize}
    \end{flushleft}

\end{document}