Manual for the tcolorbox package

tcb/bottom=〈length〉
(no default, initially 2mm)
Sets the bottom space between text and frame (additional to boxsep).
\tcbset{colback=red!5!white,colframe=red!75!black}
\begin{tcolorbox}[bottom=0mm]
This is a \textbf{tcolorbox}.
\tcblower
This is the lower part.
\end{tcolorbox}
This is a tcolorbox.
This is the lower part.
/tcb/bottomtitle=〈length〉
(no default, initially 0mm)
Sets the bottom space between title and frame (additional to boxsep).
\tcbset{colback=red!5!white,colframe=red!75!black}
\begin{tcolorbox}[bottomtitle=3mm,title=My title]
This is a \textbf{tcolorbox}.
\end{tcolorbox}
My title
This is a tcolorbox.
/tcb/middle=〈length〉
(no default, initially 2mm)
Sets the space between upper and lower text to the separation line (additional to boxsep).
\tcbset{colback=red!5!white,colframe=red!75!black}
\begin{tcolorbox}[middle=0mm,boxsep=0mm]
This is a \textbf{tcolorbox}.
\tcblower
This is the lower part.
\end{tcolorbox}
This is a tcolorbox.
This is the lower part.
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