featured content on iPhone

Hello, Sorry for bothering you again, nut I see no other option. I have a featured content section. And I use the image format 350 x 157 px. I see in some catch themes, that on a iPhone there are two images beside each other. In our theme this doesn’t seem possible. And this caused that the view on an iPhone isn’t beautiful. Is there a solution for this little problem. Kind regards Hans Hagmeijer