\documentclass[a4paper]{article}

% languages
\usepackage[russian,english]{babel}

% layout & toc
\usepackage[labelformat=empty]{caption}
% remove section numbers and keep-up with toc
\renewcommand{\thesection}{}
\usepackage[cm]{fullpage}
\usepackage{url}

% utf8 fonts
\usepackage{fontspec}
\setmainfont{FreeSerif}
\setsansfont{FreeSerif}
\setmonofont{FreeMono}

% code blocks & inline code
\usepackage{xcolor,listings}
\definecolor{mygray}{gray}{0.94}
\lstset{
        backgroundcolor=\color{mygray},
        xleftmargin=0.5in,
        xrightmargin=.25in,
        breaklines=true,
        tabsize=8,
}

\begin{document}

Here's some \colorbox{mygray}{\lstinline{inline code}} and here comes a code block.

\begin{lstlisting}
  |\_/|        ****************************    (\_/)
 / @ @ \       *  "Purrrfectly pleasant"  *   (='.'=)
( > º < )      *       Poppy Prinz        *   (")_(")
 `>>x<<´       *   (pprinz@example.com)   *
 /  O  \       ****************************
\end{lstlisting}

\end{document}