Black bar under some background images

Hi, on the mobile version of this site http://217.199.187.198/beachhousetwo.co.uk/ (on larger tablet devices on landscape) there is like a black bar at the bottom of the home page, gallery page and menu page. all the images are the same size and setting on all pages but only has this problem on these pages. Here is a link to a screenshot of what it looks like on an iPad http://217.199.187.198/beachhousetwo.co.uk/wp-content/uploads/2015/09/Screenshot.jpg . Is there any way that the black bar can be removed and the image stretched right to the bottom of the page even if the page needs to be scrolled to see all of the content. Thanks.