diff --git a/beamerthemeSimple.sty b/beamerthemeSimple.sty
index 5491f91..f8ad7f1 100644
--- a/beamerthemeSimple.sty
+++ b/beamerthemeSimple.sty
@@ -1,13 +1,16 @@
-% Copyright 2018 by Zhibo Wang
-%
-% This file may be distributed and/or modified
-% under the LaTeX Project Public License
-\usepackage[sfdefault]{FiraSans}
+% !TEX program = xelatex
+% !TEX TS-program = xelatex
+% fonts
+\RequirePackage[sfdefault]{FiraSans}
+\RequirePackage[mathrm=sym]{unicode-math}
+\setmathfont{Fira Math}
+
 \RequirePackage[english]{babel}
 \RequirePackage{fancyhdr}        % header footer
-\RequirePackage{xcolor}
+\RequirePackage[dvipsnames]{xcolor}
 \RequirePackage{bookmark}
 \RequirePackage{hyperref}[colorlinks=true,urlcolor=Blue,citecolor=Green,linkcolor=BrickRed,unicode]
+\RequirePackage{natbib}
 \RequirePackage{graphicx} % Allows including images
 \RequirePackage{booktabs} % Allows the use of \toprule, \midrule and \bottomrule in tables
 % \RequirePackage{tikz}
@@ -20,9 +23,9 @@
 \RequirePackage{subcaption}
 \RequirePackage{amsmath}
 \RequirePackage{amsthm}
-\RequirePackage[utf8]{inputenc}
-\RequirePackage{CJKutf8}
-\def\zh#1{\begin{CJK}{UTF8}{gbsn}#1\end{CJK}}
+% \RequirePackage[utf8]{inputenc}
+% \RequirePackage{CJKutf8}
+% \def\zh#1{\begin{CJK}{UTF8}{gbsn}#1\end{CJK}}
 \RequirePackage{aliascnt}
 
 % a color box
@@ -125,7 +128,7 @@
 \setbeamercolor{alerted text}{fg=beamer@simple@color}
 \setbeamerfont{block title alerted}{series=\mdseries}
 \setbeamerfont{alerted text}{series=\bfseries\boldmath}
-\hypersetup{colorlinks,linkcolor=,urlcolor=oliver}
+\hypersetup{colorlinks=true,linkcolor=,citecolor=Green,urlcolor=oliver}
 % \usefonttheme[onlymath]{serif}
 \setbeamerfont{frametitle}{series=\bfseries\boldmath}
 \setbeamerfont{block title}{series=\bfseries\boldmath}
diff --git a/main.pdf b/main.pdf
index 1b1afa6..174d6e6 100644
Binary files a/main.pdf and b/main.pdf differ
diff --git a/main.tex b/main.tex
index 916bb3d..1f526db 100644
--- a/main.tex
+++ b/main.tex
@@ -2,7 +2,7 @@
 
 \title[template example]{Minimizing the Sum of Piecewise Linear Convex Functions}
 \date{\today}
-\author{\texorpdfstring{\zh{丛宇}}{Yu Cong}}
+\author{Yu Cong}
 % \AtBeginSection[]{
 %     \frame{\frametitle{Outline}\tableofcontents[currentsection, 
 %     subsectionstyle=show/show/shaded]}