@Nancy Aarya
Plugin only shows your code. You can wrap code to html tags
<center> (your code here) </center>
or
<div style="display:block;width:auto;margin:0 auto;float:none;"> (your code here) </div>
or
<div style="display:inline-block;width:auto;margin:0 auto;float:none;"> (your code here) </div>
or
<div style="display:float:left;width:100%;clear:both;text-align:center;"><div style="display:inline-block;width:auto;float:none;"> (your code here) </div></div>