\documentclass{beamer}

\usepackage{tikz}
\usepackage{pgflibraryshapes}
\usetikzlibrary{backgrounds}
\usetikzlibrary{arrows}
\newenvironment{changemargin}[2]{%
  \begin{list}{}{%
    \setlength{\topsep}{0pt}%
    \setlength{\leftmargin}{#1}%
    \setlength{\rightmargin}{#2}%
    \setlength{\listparindent}{\parindent}%
    \setlength{\itemindent}{\parindent}%
    \setlength{\parsep}{\parskip}%
  }%
  \item[]}{\end{list}}

\begin{document}
\begin{frame}{}
\begin{changemargin}{-1cm}{0cm}
\begin{center}
\begin{tikzpicture}[scale = 10.00,font=\fontsize{8}{8}\selectfont]
\draw (0.5,0.9) node [rectangle, draw, align=center, inner sep=1ex] {TS: pseudo};
\draw (0.5,0.83) node [rectangle, draw, align=center, inner sep=1ex] {SNES: newtonls};
\draw (0.5,0.76) node [rectangle, draw, align=center, inner sep=1ex] {KSP: gmres};
\draw (0.5,0.69) node [rectangle, draw, align=center, inner sep=1ex] {PC: ilu (16)};
\end{tikzpicture}
\end{center}
\end{changemargin}
\end{frame}
\end{document}