\usepackage{tikz}

\usepackage{pgf}

\usetikzlibrary{positioning}

\usetikzlibrary{calc}

\usetikzlibrary{automata}

\usetikzlibrary{arrows}

\usetikzlibrary{backgrounds}

\usetikzlibrary{fit}

\usepackage{tikz-qtree}

\usepackage{graphicx} 

\usepackage{pgfplots}

\pgfplotsset{compat=1.11}

\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]% 

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

{\end{minipage}\egroup;%

\end{tikzpicture}\bigskip}