diff --git a/README.md b/README.md
index 73281ff..5d2a4a1 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,13 @@
 
 This project include two themes, long and short version. When you are making a long slide, a sidebar with table of content and the current section you are talking about is necessary. Then, you can write your file based on `template_long.tex`, otherwise `template_short.tex`.
 
-`.pdf` files and demos below show the baisc style of this beamer theme. 
+`.pdf` files in `examples` folder and demos below show the baisc style of this beamer theme. 
 
 ## Usage
 
-You can just input one of the template files and define colors you like to inherit this theme. Just like what `example_*.tex`s do.
+You can run `example_short.tex` and `example_long.tex` directly to see the demos.
+
+When writing your own files, just input one of the template files and define colors you like to inherit this theme. Just like what `example_*.tex`s do.
 
 For example
 
@@ -34,6 +36,18 @@ Of course, you cna modify the theme based on the two template files to extend ne
 
 ## Demos
 
-![long green version](long_green.jpg)
+long green version
 
-![long red version](long_red.jpg)
\ No newline at end of file
+![](imgs/long_green.jpg)
+
+long red version
+
+![](imgs/long_red.jpg)
+
+short green version
+
+![](imgs/short_green.jpg)
+
+short red version
+
+![](imgs/short_red.jpg)
\ No newline at end of file
diff --git a/example_long.tex b/example_long.tex
index f9f1041..48456f7 100644
--- a/example_long.tex
+++ b/example_long.tex
@@ -2,7 +2,7 @@
 
 \input{template_long.tex}
 
-\colorlet{main}{green!50!black}
+%% use one of the two below
 % \colorlet{main}{red!50!black}
 % \colorlet{main}{purple}
 
diff --git a/example_short.tex b/example_short.tex
new file mode 100644
index 0000000..2896674
--- /dev/null
+++ b/example_short.tex
@@ -0,0 +1,103 @@
+\documentclass{beamer}
+
+\input{template_short.tex}
+
+%% use one of the two below
+% \colorlet{main}{red!50!black}
+% \colorlet{main}{purple}
+
+%-------------------main body-------------------------%
+
+\author{Your Name}
+\title{Presentation Title}
+\date{January 1, 2018}
+
+\begin{document}
+
+\frame[plain]{\titlepage}
+
+\begin{frame}
+\frametitle{Outline}
+\tableofcontents
+\end{frame}
+
+\section{Page Title}
+
+\begin{frame}
+\frametitle{Page Title}
+
+TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems.
+
+\vspace{0.4cm}
+
+unordered list below
+
+\begin{itemize}
+\item The first item
+\item The second item
+\item The third item
+\item The fourth item
+\end{itemize}
+
+\end{frame}
+
+\section{Display Theorem}
+
+\subsection{first subsection}
+
+\subsection{second subsection}
+
+
+
+\begin{frame}
+  \frametitle{Display Theorem}
+  \begin{theorem}
+    $1 + 2 = 3$
+  \end{theorem}
+  \begin{proof}
+    $$1 + 1 = 2$$
+    $$1 + 1 + 1 = 3$$
+  \end{proof}
+\end{frame}
+
+\section{Sample frame title}
+
+\begin{frame}
+\frametitle{Sample frame title}
+This is a text in second frame.
+For the sake of showing an example.
+
+\begin{itemize}
+ \item Text visible on slide 1
+ \item Text visible on slide 2
+ \item Text visible on slide 3
+\end{itemize}
+
+\vspace{0.3cm}
+
+another example
+
+\begin{itemize}\itemsep0em
+ \item Text visible on slide 1
+ \item Text visible on slide 2
+ \item Text visible on slide 3
+\end{itemize}
+\end{frame}
+
+\begin{frame}
+  \begin{proof}
+    $$
+ \frac{1}{\displaystyle 1+
+   \frac{1}{\displaystyle 2+
+   \frac{1}{\displaystyle 3+x}}} +
+ \frac{1}{1+\frac{1}{2+\frac{1}{3+x}}}
+$$
+$$\int_0^\infty e^{-x^2} dx=\frac{\sqrt{\pi}}{2}$$
+\begin{equation} x=y+3 \label{eq:xdef}
+\end{equation}
+In equation (\ref{eq:xdef}) we saw $\dots$
+  \end{proof}
+\end{frame}
+
+
+\end{document} 
\ No newline at end of file
diff --git a/long_green.pdf b/examples/long_green.pdf
similarity index 100%
rename from long_green.pdf
rename to examples/long_green.pdf
diff --git a/long_red.pdf b/examples/long_red.pdf
similarity index 100%
rename from long_red.pdf
rename to examples/long_red.pdf
diff --git a/examples/short_green.pdf b/examples/short_green.pdf
new file mode 100644
index 0000000..99819d0
Binary files /dev/null and b/examples/short_green.pdf differ
diff --git a/examples/short_red.pdf b/examples/short_red.pdf
new file mode 100644
index 0000000..764953c
Binary files /dev/null and b/examples/short_red.pdf differ
diff --git a/long_green.jpg b/imgs/long_green.jpg
similarity index 100%
rename from long_green.jpg
rename to imgs/long_green.jpg
diff --git a/long_red.jpg b/imgs/long_red.jpg
similarity index 100%
rename from long_red.jpg
rename to imgs/long_red.jpg
diff --git a/imgs/short_green.jpg b/imgs/short_green.jpg
new file mode 100644
index 0000000..cf27ff3
Binary files /dev/null and b/imgs/short_green.jpg differ
diff --git a/imgs/short_red.jpg b/imgs/short_red.jpg
new file mode 100644
index 0000000..c8186cb
Binary files /dev/null and b/imgs/short_red.jpg differ
diff --git a/template_long.tex b/template_long.tex
index 17b9de6..fe7c788 100644
--- a/template_long.tex
+++ b/template_long.tex
@@ -42,6 +42,7 @@
 \definecolor{bistre}{rgb}{0.24, 0.17, 0.12} % a kind of black
 \definecolor{mygrey}{rgb}{0.52, 0.52, 0.51} % a kind of grey
 \colorlet{text}{bistre!100!white} % from now on, `text` implies the color defined
+\colorlet{main}{green!50!black}
 
 % set colors to elements, fg is the color itself, bg is the background color, !num! implies gradient
 \setbeamercolor{title}{fg=main}
@@ -55,7 +56,7 @@
 % footline color
 \setbeamercolor{author in head/foot}{fg=black, bg=mygrey!5!white}
 \setbeamercolor{title in head/foot}{fg=black, bg=mygrey!5!white}
-\setbeamercolor{structure}{fg=main, bg=mygrey!10!white} % 设置sidebar颜色
+\setbeamercolor{structure}{fg=main, bg=mygrey!10!white} % set sidebar color
 
 % margin left and right, and fontsize of sidebar
 \def\swidth{2.3cm}
diff --git a/template_short.tex b/template_short.tex
new file mode 100644
index 0000000..253730d
--- /dev/null
+++ b/template_short.tex
@@ -0,0 +1,43 @@
+% This file contains some settings , it need to be input by your tex file.
+
+\usepackage[english]{babel}
+% TOC(table of content) using ordered list
+\setbeamertemplate{section in toc}[sections numbered]
+% unordered list using solid point
+\setbeamertemplate{itemize item}{$\bullet$}
+% set frame title for each page
+\setbeamertemplate{frametitle}
+  {\vspace{1cm}
+   \insertframetitle
+   \vspace{-0.5cm}}
+% delete original navigation
+\setbeamertemplate{navigation symbols}{}
+% set footline
+\setbeamertemplate{footline}[text line]{%
+    \hfill\strut{%
+        \scriptsize\sf\color{black!60}%
+        \quad\insertframenumber
+    }%
+    \hfill
+}
+
+
+% define color
+%\definecolor{alizarin}{rgb}{0.82, 0.1, 0.26} % a kind of red
+%\definecolor{DarkFern}{HTML}{407428} % a kind of green
+%\colorlet{main}{DarkFern!100!white} % first setting way(with color newly defined)
+%\colorlet{main}{red!70!black} % second setting way(with internal color by setting gradient)
+\definecolor{bistre}{rgb}{0.24, 0.17, 0.12} % a kind of black
+\definecolor{mygrey}{rgb}{0.52, 0.52, 0.51} % a kind of grey
+\colorlet{text}{bistre!100!white} % from now on, `text` implies the color defined
+\colorlet{main}{green!50!black}
+
+% set colors to elements, fg is the color itself, bg is the background color, !num! implies gradient
+\setbeamercolor{title}{fg=main}
+\setbeamercolor{frametitle}{fg=main}
+\setbeamercolor{section in toc}{fg=text}
+\setbeamercolor{normal text}{fg=text}
+\setbeamercolor{block title}{fg=main,bg=mygrey!14!white}
+\setbeamercolor{block body}{fg=black,bg=mygrey!10!white}
+\setbeamercolor{qed symbol}{fg=main} % frame after proof
+\setbeamercolor{math text}{fg=black}