\documentclass[11pt,titlepage,a4paper]{article}
\usepackage[latin2]{inputenc}
\usepackage{czech}

\begin{document}
\begin{center}
\rule{\textwidth}{0.5mm}
\vskip 0.5cm
\begin{tabular*}{0.90\textwidth}{@{\extracolsep{\fill}}lp{6cm}c}
  \bf P��kaz            & \bf Popis                   & X \\
\hline 
  \tt \verb|\textwidth| & Vrac� d�lku ��dky.          & x \\
  \tt \verb|\fill|      & Pru�n� horizont�ln� mezera, chov� se 
                          tak, �e vypln� co se d�.    & x \\
  \tt \verb|\|verb      & V�e mezi uvozovac�mi znaky se 
                          pova�uje za text a neinterpretuje se. 
                                                      & x \\
\end{tabular*}
\end{center}
\end{document}