How can I change the background color of a specific paragraph on a page?

Question

TeX

I want to make the background color of the paragraph with the code gray, but all the methods that I tried change the background color of the entire page. Tell me what I'm doing wrong.
Here is a paragraph:

\begin{verbatim}
var a, b: integer;
begin
    a := 3;
    b := 7;
    ...
end.
\end{verbatim}

If you use the command before this paragraph, then the color of the entire page changes. If you use before a paragraph , and after , then the background color of the paragraph and the page remains white. Here is an example of what I want to do from the LaTeX tutorial. But, unfortunately, how to do the same is not said there. PS I didn't read anything in the documentation for the color package either, although I admit that it is there. \pagecolor {grey}\pagecolor {grey}\pagecolor {white}

Answer 1

\usepackage{framed} 
\usepackage{xcolor} 
\colorlet{shadecolor}{gray!25} 
  
\begin{shaded} 
text
\end{shaded}