Awesome Templates

\documentclass{article}
\usepackage[margin=25mm]{geometry}
\usepackage{graphicx}
\usepackage{fancyhdr}
\usepackage{cite}
% \usepackage[linesnumbered,boxed, lined, ruled, vlined]{algorithm2e}
\usepackage{listings}
\usepackage{xcolor}
\usepackage{graphicx}
% \usepackage{aligned-overset}
\usepackage{url}
\usepackage{appendix}    
\usepackage{mathbbol}
\usepackage{amsmath}
\usepackage{authblk}
\usepackage{subfigure}
\usepackage{float}
\definecolor{codegreen}{rgb}{0,0.6,0}
\definecolor{codegray}{rgb}{0.5,0.5,0.5}
\definecolor{codepurple}{rgb}{0.58,0,0.82}
\definecolor{backcolour}{rgb}{0.95,0.95,0.92}
\lstdefinestyle{mystyle}{
    backgroundcolor=\color{backcolour},   
    commentstyle=\color{codegreen},
    keywordstyle=\color{magenta},
    numberstyle=\tiny\color{codegray},
    stringstyle=\color{codepurple},
    basicstyle=\ttfamily\footnotesize,
    breakatwhitespace=false,         
    breaklines=true,                 
    captionpos=b,                    
    keepspaces=true,                 
    numbers=left,                    
    numbersep=5pt,                  
    showspaces=false,                
    showstringspaces=false,
    showtabs=false,                  
    tabsize=2
}
\usepackage{tikz}
\usetikzlibrary{positioning, calc, shapes.geometric, shapes, shapes.multipart, arrows.meta, arrows, decorations.markings, external, trees}
\usepackage{lscape}
\usepackage{fancyvrb}
\usepackage{parskip}
\usepackage{framed}
\usepackage[utf8]{inputenc}
\usepackage{hyperref}
\hypersetup{
    colorlinks=true,
    linkcolor=black,
    filecolor=black,      
    urlcolor=blue,
}
\lstset{style=mystyle}
\pagestyle{fancy}
\lhead{Y.-Z. Shi}

\title{Title}
\author{Yu-Zhe Shi}

\begin{document}
\newtheorem{proof}{\hspace{2em}Proof}
\newtheorem{lemma}{\hspace{2em}Lemma}
\newtheorem{definition}{\hspace{2em}Definition}
\newtheorem{proposition}{\hspace{2em}Proposition}
\maketitle



\end{document}