I want to put the text A
into the right bottom corner of the node rectangle without changing any other stuff. Please help me.
\documentclass[10pt]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw [help lines] (0,0) grid (40pt,40pt);
\node [draw,minimum height = 30pt, minimum width = 30pt, inner sep = 0] at (15pt,15pt) {$A$};
\end{tikzpicture}
\end{document}