documentclass{article}
usepackage[T1]{fontenc}
usepackage{tikz,tikzpagenodes}
usepackage[most]{tcolorbox}
usetikzlibrary{calc}
usetikzlibrary{intersections, patterns}
tcbuselibrary{skins}
usepackage{lipsum}
usepackage{xcolor,etoolbox}



definecolor{boxcolor}{RGB}{50,232,250}

newtcbox{exobox}{on line,
arc=7pt,colback=white!10!white,colframe=boxcolor,
before upper={rule[-3pt]{0pt}{10pt}},boxrule=2pt,
boxsep=0pt,left=12pt,right=12pt,top=2pt,bottom=2pt}


begin{document}
exobox{ See exercise 3}

end{document}

%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
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