change size of a post in wordpress

how can i set the width of a particular post in wordpress site. i.e, i want to post a single post in a particular page and that post must occupy the whole page (body section) for that i already removed the sidebar for that page but i can't set the width of that post.........

 

for example http://indimovi.net/temp-2/ here though i gave iframe dimensions its not exceeding the actual post width...
plz suggest a solution.....

 

Change the width of

div#main{
	width: 660px;
	float: left;
	display: inline;/* fix double margin */
	margin: 30px 25px 30px 10px;
	}

Code (markup):

and delete "float: left" (if you don't use sidebar) in the style.css of the theme.

 

by doing this the sidebar will not come in all pages
but i want the side bar in remaining pages except that particular page......

 

Try this:

Change the

<div id="main">

Code (markup):

to

<div id="main" <?php if(get_the_ID()==THE_POST_ID){ echo('style="width: 100%"'); } ?>>

Code (markup):

in the single.php of the theme. And change THE_POST_ID to the post id for which you want to do this all.

 

still no use....
is there any way to edit the html of that page

 

Login to admin panel, then go to the "Appearance"->"Editor" and chose the file single.php on the right panel and edit it.