isomteric_dotted_headerfooter.tex

\documentclass{article}

% Author: Subhodeep Sarkar
% Date: 7 April, 2021

%generate dots and set the geometry
% I like really thin margins. Feel free to  adjust this
% as per your tastes.

\usepackage[pattern=dot, 
patternsize=0.2in, 
textarea,
geometry={
	a4paper,
	left=8mm,
	right=8mm,
	top=15mm,
	bottom=15mm,
	headsep=10pt,
	footskip=25pt,
}
]{gridpapers}
% https://github.com/mcnees/LaTeX-Graph-Paper
% thanks Prof. McNees and Prof. Leo
%you can print grids or triangles as well

%header and footer
\usepackage{fancyhdr}
\pagestyle{fancy}

%header and footer text
\lhead{\textcolor{gray}{Prof. Hubert J. Farnsworth}}
\rhead{\textcolor{gray}{Date: {~~~/~~~/~~~~}; Page No.: {~~~~}}}
\cfoot{\textcolor{gray}{Department of Theoretical Physics, Mars University}}

%colouring the horizontal lines in the header and footer
% https://tex.stackexchange.com/questions/375121/change-horizontal-line-color-on-top-of-footer
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
% Save standard definitions
\let\HeadRule\headrule
\let\FootRule\footrule
% Add color to standard definitions.
\renewcommand\headrule{\color{gray}\HeadRule}
\renewcommand\footrule{\textcolor{gray}{\FootRule}}

%all done

\begin{document}
	
	~ %otherwise there will be an error
	
\end{document}