Controlling height of box

Question

I am currently using the code

 \newsavebox{\FVerbB}
\newenvironment{code}
 {\VerbatimEnvironment
 \hspace{-0.25cm}
  \begin{lrbox}{\FVerbB}
  \hspace{-0.29cm}
  \begin{BVerbatim}}
 {\end{BVerbatim}
 \hspace{-0.29cm}
  \end{lrbox}
  \fcolorbox{blue!0}{gray!30}{\usebox{\FVerbB}}
  }

I have decreased the horizontal size of the box by adding hspace{-0.29cm}. I would like to do something similar for the vertical size of the box...i.e. I would like to include a vspace{-0.1cm} somewhere in this code, but I can't figure out where to put it. Any suggestions? Thanks so much in advance!

Update: the suggestions for the vertical resizing have worked brilliantly. But I have run into an issue with the box extending too far out in front of the enclosed text. Below is an example.

I don't like that there is no space before the word "is". Any thoughts on how to fix this? Thanks so much!

Answer 1

You have some trailing spaces in your code. However, I suppose you are looking for something like this:

\documentclass{article}
\usepackage{fancyvrb}
\usepackage{xcolor}
\newenvironment{code}
 {\VerbatimEnvironment
  \begin{SaveVerbatim}{VerbEnv}}
 {\end{SaveVerbatim}%
   \fboxsep=1pt   
   \fcolorbox{black}{gray!30}{\BUseVerbatim{VerbEnv}}}
\begin{document}
\begin{code}
fog
\end{code}

\end{document}

Use \colorbox instead of \fcolorbox if you do not want a frame.