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To create a course summary, I created a tcolorbox that I call for each new page. There is therefore only 1 box per summary page.

This summary is indexed by 1/2 (first page on a total of 2) 2/2 (second page on a total of 2), etc.

• To number each page, I used auto counter which normally counts the number of boxes. But as here, there are as many boxes as there are pages, it comes back in practice to the same.


• To get the total number of pages, I created a label label={number-of-pages}.

It compiles perfectly but I get a warning.

LaTeX Warning: Label `nombre-de-page' multiply defined.

Is it possible to number each page in the same way without creating a warning?

• 
  1/2 and 2/2 for 2 pages;


• 
  1/3 then 2/3 and 3/3 for 3 pages;


• Or 1/4; 2/4; 3/4 and 4/4 for 4 pages;


• etc

documentclass{article}

usepackage{lipsum}

usepackage{xfrac}

usepackage[most]{tcolorbox}



%%%%%%%%%%%%%%%%%%%%%%%%%%%

% boite resumé



defcouleurresume{red}%



% style du titre « résumé du cours »

tcbset{titreresume/.style={

    boxed title style={

        colframe=couleurresume!50,%

        colback=couleurresume!10,%

        coltext=blue,%

    leftrule=1.5mm,rightrule=1.5mm,toprule=1.5pt,bottom=0pt,boxsep=1pt}}

}



% style des soustitres des résumés

tcbset{soustitre/.style={

    subtitle style={%

    colback=couleurresume!7,%

    colframe=couleurresume!50,%

    boxsep=1mm,

    fontupper={sffamilybfserieslargeselectfontcolor{couleurresume!63!black}}}}

}



% style du titre-boxed des encadrés

tcbset{titrecadre/.style={%

    minipage boxed title*=-.5linewidth,

    boxed title style={

        boxrule=.8pt,boxsep=0pt,toptitle=0pt,

        colframe=couleurresume!55,colback=white},

    halign title=left}

}



% boite créant la boite résumé

newtcolorbox[auto counter]{resume}[2]{%

    label={nombre-de-page},

    minipage boxed title*=-106mm,

    attach boxed title to top center={yshift=-3mm,xshift=-linewidth/5},

    enhanced,

    nobeforeafter,

    lower separated=false,

    before upper={

        textcolor{couleurresume!63!black}{sfrac{#1}{thenumexpr#1+1} hfill{#2}hfillthetcbcounter/pageref{nombre-de-page}}},

    colframe=couleurresume!50,%

    colback=white,%

    coltitle=couleurresume!63!black,%

leftrule=3mm,rightrule=3mm,toprule=2pt,bottomrule=2pt,left=3pt,right=0pt,top=3mm,

fonttitle=sffamilybfserieslarge,

    titreresume,soustitre,title={normalsize Résumé}

}





begin{document}



begin{resume}[2018]{chapitre 1}

tcbsubtitle{Définition}



lipsum[1]

end{resume}



newpage



begin{resume}[2018]{chapitre 1}



tcbsubtitle{Propriétés}

lipsum[2]

end{resume}

end{document}

The numbering is highlighted in yellow.

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