--- a/graphics.sty	Thu Jul 30 13:50:54 2020 +0100
+++ b/graphics.sty	Sat Aug 15 14:18:37 2020 +0100
@@ -6,16 +6,19 @@
 \usetikzlibrary{arrows}
 \usetikzlibrary{backgrounds}
 \usetikzlibrary{fit}
+\usetikzlibrary{shadows}
 \usepackage{tikz-qtree}
 \usepackage{graphicx} 
 \usepackage{pgfplots}
 
+
+
 \pgfplotsset{compat=1.15}
 
 \newenvironment{bubble}[1][]{%
 \addtolength{\leftmargini}{4mm}%
 \begin{tikzpicture}[baseline=(current bounding box.north)]%
-\draw (0,0) node[inner sep=2mm,fill=cream,ultra thick,draw=red,rounded corners=2mm]% 
+\draw (0,0) node[drop shadow,inner sep=2mm,fill=cream,ultra thick,draw=red,rounded corners=2mm]% 
 \bgroup\begin{minipage}{#1}\raggedright{}}
 {\end{minipage}\egroup;%
 \end{tikzpicture}\bigskip}