Catch responsive: homepage recent posts & iphone6 optimization

Hi, i'm currently using the free catch responsive theme (claudiacasanova.it). I'd like to ask you 2 questions: 1) this theme is responsive but it's not optimized for iphone6 (I saw that there are lateral white spaces only with Iphone6). I'd like to enlarge the pages displayed on the screen. is that possibile? 2) In my homepage there are both the featured content and the recent posts. Now recent posts have a thumbnail on the left and the text on the right. I'd like to increase the size of the thumbnail and put it above the text (like in the featured contents). This is important in particular for mobile view. Infact in mobile display the thumbnails become too small. Could you help me? Thanks for your job and your support Claudia