Div layouts width

I work in a grocery store, and I notice some interesting things about what customers see as far as product placement goes. I have seen so much of this, that I can honestly make something sell better or become more noticeable simply by moving it. As I get into the web-design world, and I am ever so new to it, I am kind of thinking of websites being similar. I have read that there are key places on websites where people will naturally be more likely to look. Of this, this comes to a problem with a wide array of monitor / video resolutions out there in existence. The US is predominantly wide-screen by now, so that part of the puzzle is solved. With the wide screen though, I am convinced that items hugging the left and rights sides are somewhat likely to go unnoticed. To combat this, I think it would be useful to leave a 100px gap margin, at least 100px, possibly more, to keep content in a view-able area so that surfers don’t necessarily have to “look” very hard. I was wondering if anyone agreed with this, or if you guys have any input, I would love to hear it. I have started a website, and I want it to be as user-friendly as possible.

Hmmm. that seems an inconvenient way of getting attention. Not to mention it EXPECTS a particular monitor AND viewport size. Remember, just because my monitor is 1600px wide doesn’t mean every window open is the at that maximum width. What you have mentioned about placement is a commendable observation, but more consideration is needed. This could be a case where responsive web deign is also helpful.

I think it is view user-frendly to have all layout centered (with #id { margin: 0 auto; } ),
or, to add a padding to body, html, in percentage ( body, html { padding: 0, 5%; } ).

Sorry, but that’s like saying that cars are more user-friendly if they’re red. That’s one quite popular way of doing things, but there are other, equally legitimate ways to appeal to a user than centering a layout and using universal side padding. There is no one-size-fits-all solution to anything.