[Solved] Shadow of a frame remains

Erwann Asks: Shadow of a frame remains
The setup below leaves a shadow of a frame around the input. How can I make the box blend totally with the background?

Code:
documentclass{article}
usepackage{tcolorbox}
tcbuselibrary{listings, breakable}

newtcblisting
{internal}
{text only,
  breakable,
  colback=white,
  fontupper=sffamily,
  arc=0pt,
  outer arc=0pt,
  boxrule=0pt,
  halign=left,
  fontupper=smallsffamily,
  left=0pt,
  top=0pt,
  bottom=0pt}

begin{document}

begin{internal}
LaTeX
end{internal}

end{document}


enter image description here

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