Modifying the margins of all slides in Beamer

I have difficulty with setting a standard margins from the left and right side in the Beamer. Any help is appreciated.

This template has been downloaded from:

http://www.LaTeXTemplates.com

documentclass{beamer}

mode<presentation> {
usetheme{Madrid}
}

usepackage{graphicx} % Allows including images
usepackage{booktabs} % Allows the use of toprule, midrule and bottomrule in tables

title[Short title]{Full Title of the Talk} % The short title appears at the bottom of every slide, the full title is only on the title page

author{John Smith} % Your name
institute[UCLA] % Your institution as it will appear on the bottom of every slide, may be shorthand to save space
{
University of California  % Your institution for the title page
medskip
textit{[email protected]} % Your email address
}
date{today} % Date, can be changed to a custom date

begin{document}

begin{frame}
titlepage % Print the title page as the first slide
end{frame}

begin{frame}
frametitle{Overview} % Table of contents slide, comment this block out to remove it
tableofcontents % Throughout your presentation, if you choose to use section{} and subsection{} commands, these will automatically be printed on this slide as an overview of your presentation
end{frame}

subsection{Subsection Example} % A subsection can be created just before a set of slides with a common theme to further break down your presentation into chunks

begin{frame}
frametitle{Paragraphs of Text}
Sed iaculis dapibus gravida. Morbi sed tortor erat, nec interdum arcu. Sed id lorem lectus. Quisque viverra augue id sem ornare non aliquam nibh tristique. Aenean in ligula nisl. Nulla sed tellus ipsum. Donec vestibulum ligula non lorem vulputate fermentum accumsan neque mollis.~

Sed diam enim, sagittis nec condimentum sit amet, ullamcorper sit amet libero. Aliquam vel dui orci, a porta odio. Nullam id suscipit ipsum. Aenean lobortis commodo sem, ut commodo leo gravida vitae. Pellentesque vehicula ante iaculis arcu pretium rutrum eget sit amet purus. Integer ornare nulla quis neque ultrices lobortis. Vestibulum ultrices tincidunt libero, quis commodo erat ullamcorper id.
end{frame}

%------------------------------------------------

begin{frame}
frametitle{Bullet Points}
begin{itemize}
item Lorem ipsum dolor sit amet, consectetur adipiscing elit
item Aliquam blandit faucibus nisi, sit amet dapibus enim tempus eu
item Nulla commodo, erat quis gravida posuere, elit lacus lobortis est, quis porttitor odio mauris at libero
item Nam cursus est eget velit posuere pellentesque
item Vestibulum faucibus velit a augue condimentum quis convallis nulla gravida
end{itemize}
end{frame}

%------------------------------------------------

begin{frame}
frametitle{Blocks of Highlighted Text}
begin{block}{Block 1}
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer lectus nisl, ultricies in feugiat rutrum, porttitor sit amet augue. Aliquam ut tortor mauris. Sed volutpat ante purus, quis accumsan dolor.
end{block}

begin{block}{Block 2}
Pellentesque sed tellus purus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Vestibulum quis magna at risus dictum tempor eu vitae velit.
end{block}

begin{block}{Block 3}
Suspendisse tincidunt sagittis gravida. Curabitur condimentum, enim sed venenatis rutrum, ipsum neque consectetur orci, sed blandit justo nisi ac lacus.
end{block}
end{frame}

%------------------------------------------------

begin{frame}
frametitle{Multiple Columns}
begin{columns}[c] % The "c" option specifies centered vertical alignment while the "t" option is used for top vertical alignment

column{.45textwidth} % Left column and width
textbf{Heading}
begin{enumerate}
item Statement
item Explanation
item Example
end{enumerate}

column{.5textwidth} % Right column and width
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer lectus nisl, ultricies in feugiat rutrum, porttitor sit amet augue. Aliquam ut tortor mauris. Sed volutpat ante purus, quis accumsan dolor.

end{columns}
end{frame}

%------------------------------------------------
section{Second Section}
%------------------------------------------------

begin{frame}
frametitle{Table}
begin{table}
begin{tabular}{l l l}
toprule
textbf{Treatments} & textbf{Response 1} & textbf{Response 2}
midrule
Treatment 1 & 0.0003262 & 0.562 
Treatment 2 & 0.0015681 & 0.910 
Treatment 3 & 0.0009271 & 0.296 
bottomrule
end{tabular}
caption{Table caption}
end{table}
end{frame}

%------------------------------------------------

begin{frame}
frametitle{Theorem}
begin{theorem}[Mass--energy equivalence]
$E = mc^2$
end{theorem}
end{frame}
    
begin{frame}[fragile] % Need to use the fragile option when verbatim is used in the slide
frametitle{Verbatim}
begin{example}[Theorem Slide Code]
begin{verbatim}
begin{frame}
frametitle{Theorem}
begin{theorem}[Mass--energy equivalence]
$E = mc^2$
end{theorem}
end{frame}end{verbatim}
end{example}
end{frame}

%------------------------------------------------

begin{frame}
frametitle{Figure}
Uncomment the code on this slide to include your own image from the same directory as the template .TeX file.
%begin{figure}
%includegraphics[width=0.8linewidth]{test}
%end{figure}
end{frame}

%------------------------------------------------

begin{frame}[fragile] % Need to use the fragile option when verbatim is used in the slide
frametitle{Citation}
An example of the verb|cite| command to cite within the presentation:~

This statement requires citation cite{p1}.
end{frame}

%------------------------------------------------

begin{frame}
frametitle{References}
footnotesize{
begin{thebibliography}{99} % Beamer does not support BibTeX so references must be inserted manually as below
bibitem[Smith, 2012]{p1} John Smith (2012)
newblock Title of the publication
newblock emph{Journal Name} 12(3), 45 -- 678.
end{thebibliography}
}
end{frame}


end{document}