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\documentclass[12pt]{article}
\usepackage{graphics}
\usepackage[dvipsnames, xllsnames, svgnames, table]{xcolor}
\usepackage{tikz}
\usepackage{tikzpagenodes}
\usetikzlibrary{arrows, shapes, positioning}
\usepackage{makecell}
\usepackage{tabularx}
\usepackage{iftex}
\usepackage{enumitem}
\usepackage{transparent}
\begin{document}
\pagestyle{empty}
\begin{tikzpicture}[remember picture, overlay]
\fill[fill=gray!40]([xshift=0mm, yshift=-10mm]current page.north west)rectangle([xshift=-100mm, yshift=-30mm]current page.north east);
\end{tikzpicture}
\end{document}