Full Width Page

I created a new template from the default template (page.php) and changed

<!--left col--><div class="eight columns">

to

<!--left col--><div class="twelve columns">

also,
at the VERY TOP of your new file (i.e. BEFORE the content you just added into it), put the following:

<?php
 /*
 Template Name: Full Width
 */
 ?>

once you’ve created a page template, you can remove the sidebar by deleting:
<?php get_sidebar(); ?>

Next, you’ll need to find the Div ID for the content and change it to:
<div id="content-fullwidth">

see http://premium.wpmudev.org/blog/create-a-full-width-page-for-wordpress-in-5-simple-steps/