# tcolorbox: how to put shadow to whole box with boxed title?

I'm working with tcolorbox to produce boxes and highlight answers to a document with questions.

The following MWE shows the box I created, separating the title into another box.

\documentclass[12pt]{article}
\usepackage[papersize={5.5in,8.5in},margin=1.5cm]{geometry}

\usepackage[many]{tcolorbox}
\usetikzlibrary{calc}
\tcbuselibrary{skins}

\newtcolorbox{resp}[1][]{%
enhanced jigsaw,%
colback=gray!20!white,%
colframe=gray!80!black,%
size=small,%
boxrule=1pt,%
halign title=flush center,%
coltitle=black,%
breakable,%
attach boxed title to top left={xshift=1cm,yshift=-\tcboxedtitleheight/2,yshifttext=-\tcboxedtitleheight/2},%
minipage boxed title=3cm,%
boxed title style={%
colback=white,%
size=fbox,%
boxrule=1pt,%
boxsep=2pt,%
underlay={%
\coordinate (dotA) at ($(interior.west) + (-0.5pt,0)$);
\coordinate (dotB) at ($(interior.east) + (0.5pt,0)$);
\begin{scope}[gray!80!black]
\fill (dotA) circle (2pt);
\fill (dotB) circle (2pt);
\end{scope}
}%
},%
#1%
}

\begin{document}
\begin{resp}
An exciting text {\ttfamily:)}
\end{resp}
\vspace{1cm}
\end{resp}
\end{document}


Result of compiling the above code:

Thanks to the documentation, I could add a shadow to the text box (the one without the title), and as the second box shows, I could do the same with the second box. Unfortunately, the title box shadow overlaps with the text box, and I wanted it to be at the same level to the text box shadow (i.e. behind the text box).

How can I apply a shadow to both boxes as a group, so the shadows of both the title and the text box could be one, and behind the text box?

• You want to have a 'halo', not a 'shadow' ;-) – user31729 Mar 5 '17 at 7:15
• @ChristianHupfer Mmmmm, that sounds good too, but what I mean with "shadow" is to also include the little one al the top right corner of the title box (see the second box of the MWE output picture). – user101590 Mar 5 '17 at 7:18
• Do you want to have the title box shadow outside of the title box, i.e. directed to 'north east'? – user31729 Mar 5 '17 at 7:21
• @ChristianHupfer I hope I understood your question. If you mean to have the title box shadow as a separate entity, so I could place it behind the text shadow, yes. If not, I'm sorry: could you specify a bit, please? :( – user101590 Mar 5 '17 at 7:24
• The titlebox and the mainbox are drawn in two individual tikzpicture. Even if you apply pgfonlayer it will not help. But there is a workaround discussed in tex.stackexchange.com/questions/24140/… – Symbol 1 Mar 5 '17 at 17:19

Something like this? You can adjust the settings to improve the match. This is just an illustration of the method.

\documentclass[12pt]{article}
\usepackage[papersize={5.5in,8.5in},margin=1.5cm]{geometry}
\usepackage[many]{tcolorbox}
\tcbuselibrary{skins}
\newtcolorbox{resp}[1][]{%
enhanced jigsaw,
colback=gray!20!white,%
colframe=gray!80!black,
size=small,
boxrule=1pt,
halign title=flush center,
coltitle=black,
breakable,
attach boxed title to top left={xshift=1cm,yshift=-\tcboxedtitleheight/2,yshifttext=-\tcboxedtitleheight/2},
minipage boxed title=3cm,
boxed title style={%
colback=white,
size=fbox,
boxrule=1pt,
boxsep=2pt,
underlay={%
\coordinate (dotA) at ($(interior.west) + (-0.5pt,0)$);
\coordinate (dotB) at ($(interior.east) + (0.5pt,0)$);
\begin{scope}
\clip (interior.north west) rectangle ([xshift=3ex]interior.east);
\end{scope}
\begin{scope}[gray!80!black]
\fill (dotA) circle (2pt);
\fill (dotB) circle (2pt);
\end{scope}
},
},
#1,
}

\begin{document}
\begin{resp}
An box with a shadow {\ttfamily:)}
\end{resp}
\end{document}

• Interesting =) That's a good trick. In fact, it comes in handy with blur shadows. But I have to ask: is it possible to do the same without the blur effect? – user101590 Mar 6 '17 at 2:42
• I got it. I only changed the clipping and rectangle positions as you said, and replaced the blur shadow with a drop one. Unfortunately, it seems tcolorbox uses a different rounded corners value for shadows than the given ones for the size shorcuts. By the way, I didn't know tikz could handle clipping like CorelDRAW or Photoshop :D – user101590 Mar 6 '17 at 3:26
• @JBFWP286 Non-blur is actually standard. I just did it with blur to show that was possible too. Just load plain shadows for drop shadow. The blurred shadows sometimes look better. They sometimes look worse. And they occasionally look crazy ;). toclorbox uses rounded corners=\kvtcb@arc I think. – cfr Mar 6 '17 at 22:27