Featured Slider Image Not Responsive

Regarding my new site: http://ve3eby.ca/ I am using Clean Business Pro. In the theme instructions, the Slider image is stated as 1920px x 514px. This size does not conform to the slider. When I checked your Demo, the size was 1920px x 1080px. The latter size works well on my Windows 10 PC, but on an Apple iPad or Samsung Tablet, the upper portion of the image is cut off. The same happens when viewing the Catch Themes Demo. Any suggestions please? Regards, Paul Stuart