在页面上垂直居中 tcolorbox

Question

我试图将tcolorbox页面垂直居中，但下面的代码使框并不正好位于页面的中间。

到目前为止我已经尝试过这个：

\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}

结果如下：

如您所见，页面顶部的空间比底部的空间略大。

我怎样才能摆脱这个问题？

任何帮助将不胜感激。

Answer 1

只需在页面末尾添加一个空白框：

\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} 

Answer 2

为了使页面上的 tcolorbox 垂直居中，您可以将 tcolorbox 放入另一个与页面一样大的 tcolorbox 中。
然后使用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}