1 \usepackage{tikz}

     2 \usepackage{pgf}

     3 \usetikzlibrary{positioning}

     4 \usetikzlibrary{calc}

     5 \usetikzlibrary{automata}

     6 \usetikzlibrary{arrows}

     7 \usetikzlibrary{backgrounds}

     8 \usetikzlibrary{fit}

     9 \usepackage{tikz-qtree}

    10 \usepackage{graphicx} 

    11 \usepackage{pgfplots}

    12 

    13 \pgfplotsset{compat=1.11}

    14 

    15 \newenvironment{bubble}[1][]{%

    16 \addtolength{\leftmargini}{4mm}%

    17 \begin{tikzpicture}[baseline=(current bounding box.north)]%

    18 \draw (0,0) node[inner sep=2mm,fill=cream,ultra thick,draw=red,rounded corners=2mm]% 

    19 \bgroup\begin{minipage}{#1}\raggedright{}}

    20 {\end{minipage}\egroup;%

    21 \end{tikzpicture}\bigskip}