Graying out texts with/without lines with LaTeX?

Question

This is a screen capture from Pragmatic Bookshelf.

How to make this boxed text with LaTeX? It has it\'s own heading with underline, and uses color.

And

Answer 1

You should use the color package.

For example,

\colorbox{red}{Black text on red background}

creates a black text, with a red background. A good description of the color capabilities can be seen here, and an extended example here.

Answer 2

The rounded box is most easily created using TikZ:

\begin{tikzpicture}
  \draw node[draw=black,fill=black!20,rounded corners,inner sep=2ex,text width=\textwidth] {
    Lorem ipsum dolor sit amet \dots
    };
\end{tikzpicture}