how can i make align to center to featured images and also border to it like other img in post .

I use this code too .
http://forum.bytesforall.com/showthread.php?t=18607

I would use some CSS to center it.

I try some code but can't make like yours in post .

I don't Konw where should I edit css to to do that .

If it possible give us a code if not where should i try to change.

because when we remove "'<div class="thumb-shadow"><div class="post-thumb">', '</div></div>'" it's better we make a frame for featured images

look thru the css and see if you can find the .aligncenter code. Then change the thumbnail code to

'<div id="my-center">', '</div>'

and add

div#my-center a img,

to the .aligncenter CSS selector