Btukfyl

I was wondering how to create a theorem environment similar to the following example:

Specifically, the environment should resemble the box that contains "Claim -- The function g is linear".

This comes from a document written by Evan Chen, who has his style files uploaded here. I have tried to mimic what I believed to be the relevant code (as there's a lot of stuff there that isn't related to this), to no avail. I have attached my attempt below, but it may be better to ignore it.

usepackage{amsmath}

usepackage{amsthm}

usepackage{mdframed}

usepackage{thmtools}

usepackage{tikz}

usepackage{xcolor}

usepackage[framemethod=TikZ]{mdframed}

    mdfdefinestyle{mdgreenbox}{%

        linewidth=0.5pt,

        skipabove=12pt,

        frametitleaboveskip=5pt,

        frametitlebelowskip=0pt,

        skipbelow=2pt,

        frametitlefont=bfseries,

        innertopmargin=4pt,

        innerbottommargin=8pt,

        nobreak=true,

        backgroundcolor=SpringGreen!15,

        rightline=false,

        leftline=false,

        topline=false,

        bottomline=false,

        linecolor=green,

    }

    declaretheoremstyle[

        headfont=bfseriescolor{OliveGreen},

        mdframed={style=mdgreenbox},

        headpunct={\[3pt]},

        postheadspace={0pt},

    ]{thmgreenbox}

declaretheorem[style=thmgreenbox]{thrm1}

This returns an error, one for xcolor not recognizing the colors, and the following.

l.17        mdfdefinestyle

                      {mdgreenbox}{%

The package mdframed has already been loaded with options:

  

There has now been an attempt to load it with options

  [framemethod=TikZ]

Adding the global options:

  ,framemethod=TikZ

to your documentclass declaration may fix this.

Try typing  <return>  to proceed.



Package thmtools Info: Key `mdframed' (with value `style=mdgreenbox')

(thmtools)             is not a known style key.

(thmtools)             Will pass this to every declaretheorem

(thmtools)             that uses `style=thmgreenbox' on input line 39.

Package thmtools Info: Automatically pulling in `thmdef-mdframed' on input line 40.

(/usr/local/texlive/2017/texmf-dist/tex/latex/thmtools/thmdef-mdframed.sty

Package: thmdef-mdframed 2014/04/21 v66

)

c@thrm1=count282

(/compile/output.aux)

openout1 = `output.aux'.

I am looking for a way to mimic the environment more than to fix my methods.

Thank you in advance!