Wordpress/phpbb themes tweak - repost

I currently have WordPress and phpBB installed and are using responsive themes for both. Using WP-United plugin we are displaying phpBB within WordPress. As you can see at [login to view URL] the phpbb theme breaks out of the WordPress theme at large resolution although comes together as the page is made smaller. We require someone to modify the phpbb theme to fit within the relevant area of the WordPress page at all screen sizes. We anticipate this should be a simple CSS modification and should not take long to complete. Please ensure in your proposal you give an estimate of the time it will take to complete. Any copy/paste style proposals will be ignored as will bids with no proposal.