A TikZ Fullpage Document in A5 size

TikZ Fullpage.tex

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[a5paper, margin=0mm]{geometry}
\usepackage{tikz}

\begin{document}

\thispagestyle{empty}

\begin{tikzpicture}[remember picture, overlay, shift={(current page.south west)}]
    \fill[white] (current page.south west) rectangle (current page.north east);

\end{tikzpicture}

\end{document}