I'm learning LaTeX

\documentclass[a4paper,10pt,oneside]{article}
\usepackage[top=160px,bottom=0.5in,right=1in,left=1in,headheight=140pt]{geometry}
\usepackage{fancyhdr}
\usepackage[dvips]{hyperref}
\setlength{\parskip}{0pt}
\setlength{\parindent}{0pt}
\thispagestyle{fancy}
\chead{\Huge I'm Learning LaTeX}
\begin{document}
\begin{center}
\Huge Need me to write anything?
\end{center}
\end{document}