Need Help

1. I like how the screen appears on a 20 inch screen but on larger screens resolution like 1920×1200 or 1920×1080 i want the content area width to be a litter more wide. Let the background show only about 30 percent as it appears on a 20 inch screen. Same way on a 15 inch screen can the content area width be reduced by 10 percent. On smaller screen size like for tab and mobile it does not matter as the background is not visible. ( i have attached screenshots. Hope it will make more sense.)

2. Is there a way I can choose the visibility of the content on different devices. In visual composer lets say I have divided the row in 2 and have a image on the left and text on right. It looks good on desktop but on mobile the image shows first ( i want the text to show before the image ). Can that be managed.

Thanks