[Tex/LaTex] Extending the line drawn above footnotes

Question

By default the line drawn where the footer begins is small in size. How can I make it bigger and make it match with the document text area size?

Answer 1

You can modify the \footnoterule command:

\documentclass{book}
\usepackage{lipsum}
\makeatletter
\renewcommand\footnoterule{%
  \kern-3\p@
  \hrule\@width \textwidth
  \kern2.6\p@}
\makeatother
\begin{document}

Test \footnote{test} \lipsum*[1]

\end{document}