Dtyjlui

I'm wondering how I can create a note section like in the picture with two lines. I would love if I can use it as a command in LaTeX like note{some text}.

Thanks in advance.

An inevitable tcolorbox solution, providing a lot of configuration possibilities.
The default shift of the Note: is set to 1.5cm, but this can be changed by the option nodeshift=...

documentclass{article}



usepackage{blindtext}



usepackage[most]{tcolorbox}



makeatletter

NewDocumentCommand{mynote}{+O{}+m}{%

  begingroup

  tcbset{%

    noteshift/.store in=mynote@shift,

    noteshift=1.5cm

  }

  begin{tcolorbox}[nobeforeafter,

    enhanced,

    sharp corners,

    toprule=1pt,

    bottomrule=1pt,

    leftrule=0pt,

    rightrule=0pt,

    colback=yellow!20,

    #1,

    left skip=mynote@shift,

    right skip=mynote@shift,

    overlay={node[right] (mynotenode) at ([xshift=-mynote@shift]frame.west) {textbf{Note:}} ;},

    ]

    #2

  end{tcolorbox}

  endgroup

  }

makeatother



begin{document}



blindtext



mynote{Brontosaurs are thin at one end, thick in the middle and thin again at the other end}



% Exaggerated example

mynote[noteshift=4cm,colback=green!40]{Brontosaurs are thin at one end, thick in the middle and thin again at the other end}



end{document}

Is this something that you were looking for ?

Then you can use the new command notte derived from the environment quote:

documentclass{article}

usepackage{lipsum}



newlength{Lnote}

newcommand{notte}[1]

     {addtolength{leftmargini}{4em}

        settowidth{Lnote}{textbf{Note:~}}

        begin{quote}

            rule{dimexprtextwidth-2leftmargini}{1pt}\

                        mbox{}hspace{-Lnote}textbf{Note:~}%

                                            #1\[-0.5ex] 

            rule{dimexprtextwidth-2leftmargini}{1pt}

        end{quote}

        addtolength{leftmargini}{-4em}}



begin{document}

    lipsum[3]



        notte{To create a note section like in the picture, use the command texttt{notte}.}



    lipsum[4]



        notte{Another note}

end{document}

A solution with tabularx, makecell and linegoal:

documentclass{article}

usepackage{array}

usepackage{booktabs}

usepackage[svgnames, table]{xcolor}

usepackage{tabularx, makecell, linegoal}



usepackage{lipsum}% only for example text



newcommand{mynote}[1]{medskippartextbf{small Note}quadsetlength{extrarowheight}{2pt}begin{tabularx}{linegoal}{X}

Xhline{1pt}

rowcolor{WhiteSmoke!80!Lavender}#1 \

Xhline{1pt}

end{tabularx}}



    begin{document}

sffamily

    lipsum[2]



mynote{Internal pullup resistors are enabled on the MSP430F20xx to support ltextsuperscript{2}C communication}



    end{document}

I would suggest you try footnote. There should be an understanding in the text, as to the note points to which text (like references). Here is a sample code:

documentclass{article}

begin{document}

Hello World

This is text with a note.footnote{This is the note text.

Here it is at the bottom of the page.}

end{document}