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?