Vertically centering a tcolorbox on a page

Question

I'm trying to vertically center a tcolorbox on a page, but with the code below the box isn't exactly at the middle of the page.

So far I've tried this:

documentclass[12pt]{article}

usepackage{geometry}
geometry{paper=letterpaper,margin=2cm}

usepackage[autostyle]{csquotes}

usepackage[dvipsnames]{xcolor}
definecolor{marronMedio}{HTML}{AB8000}
definecolor{amariClaro}{HTML}{FFFFCA}
definecolor{grisMedio}{HTML}{999999}

usepackage[many]{tcolorbox}

newtcolorbox{phrasebox}{
  %fuzzy shadow={0.25cm}{-0.25cm}{0cm}{0.25mm}{fill=grisMedio},
  sharp corners=downhill,
  arc=7mm,
  width=12cm,
  height=5cm,
  enhanced jigsaw,
  before upper=Large,
  halign=flush center,
  valign=center,
  colframe=marronMedio,
  boxrule=0.7mm,
  colback=amariClaro
}

begin{document}
  pagenumbering{gobble}
  centering
  vspace*{fill}
  begin{phrasebox}
    enquote{Everything you can imagine is real.}[0.5cm]
    textit{--- Pablo Picasso}
  end{phrasebox}
  vspace*{fill}
end{document}

And the result is here:

As you can see, there is slightly more space at the top of the page than at the bottom.

How can I get rid of this problem?

Any help will be appreciated.

Bernard · Accepted Answer

Jsut add an empty  boxes at the end of the page:

documentclass[12pt]{article}

usepackage{geometry}
geometry{paper=letterpaper,margin=2cm, showframe}

usepackage[autostyle]{csquotes}

usepackage[dvipsnames]{xcolor}
definecolor{marronMedio}{HTML}{AB8000}
definecolor{amariClaro}{HTML}{FFFFCA}
definecolor{grisMedio}{HTML}{999999}

usepackage[many]{tcolorbox}

newtcolorbox{phrasebox}{
  %fuzzy shadow={0.25cm}{-0.25cm}{0cm}{0.25mm}{fill=grisMedio},
  sharp corners=downhill, arc=7mm, width=12cm, height=5cm, enhanced jigsaw, before upper=Large, halign=flush center, valign=center, colframe=marronMedio, boxrule=0.7mm, colback=amariClaro
}

begin{document}
  pagenumbering{gobble}
  centering
  vspace*{fill}
  begin{phrasebox}
    enquote{Everything you can imagine is real.}[0.5cm]
    textit{--- Pablo Picasso}
  end{phrasebox}
  vspace*{fill}mbox{}

end{document}

cis · Answer

For vertically centering of a tcolorbox on a page you can put the tcolorbox into another tcolorbox, which is as big as the page. 
Then use valign=center, halign=center

documentclass[12pt]{article}
usepackage[showframe=true, % <---  setto false
paper=letterpaper, margin=2cm,
]{geometry}
usepackage[autostyle]{csquotes}

usepackage[many]{tcolorbox}
newtcolorbox{phrasebox}{
  sharp corners=downhill,
  arc=7mm,
  width=12cm,
  height=5cm,
  enhanced jigsaw,
  before upper=Large,
  halign=flush center,
  valign=center,
  colframe=brown,
  boxrule=0.7mm,
  colback=yellow!40
}

tcbset{
NoGaps/.style={boxsep=0mm, left=0pt, right=0pt, top=0pt, bottom=0pt, before skip=0pt, after skip=0pt,}, 
HideBox/.style={sharp corners,  
colback=white, 
boxrule=0mm, % 0.5mm = default
colframe=white, frame hidden, 
}, 
ShowPageFrame/.is choice,
ShowPageFrame/.style={colframe=red, boxrule=1mm},
}
begin{document}
pagenumbering{gobble}
begin{tcolorbox}[HideBox, NoGaps,    
ShowPageFrame=true, % setto false
valign=center, halign=center, % Box content to page center
height=textheight, 
]
  begin{phrasebox}
    enquote{Everything you can imagine is real.}[0.5cm]
    textit{--- Pablo Picasso}
  end{phrasebox}
end{tcolorbox}
end{document}

Vertically centering a tcolorbox on a page

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