# How to change the space between text in footnotes?

I have a little problem with the space between the margin of the page and the text in the footnotes when I use footnote in the title with \maketitle as an example

\documentclass[12pt,twocolumn]{article}
\usepackage{showframe}
\usepackage{lipsum}
\title{a title\footnote{a footnote}}
\begin{document}
\maketitle
\end{document}


How can I set the space between the last line of the footnote and the bottom margin?

\documentclass{article}

Since you're using \footnote inside a \title, you need to \protect the \rule.