for this you have to remove sidebar code from files like index.php and pages.php ( <?php get_sidebar(); ?>)
and change your css as following :
line 243
#leftcolumn {
float:left;
width:920px;
}
line 414 ( remove width)
.post {
float:left;
margin:0 0 30px;
}
thats all ,
Cheers!
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