One element of web design and SEO that is referenced quite a bit is the concept of being “above the fold”. This is something that is affected by the resolution the visitor has and the size of their browser. You can now see exactly how people are viewing your site through an option in Google Analytics. To see it, you can find it here: Standard Reporting > Content > In-Page Analytics, then click “Browser Size”. You’ll get a good idea of what people are actually seeing on your page here.
To adjust your web design you can start using a “vertical responsive web design”. This adjusts the way the design responds by the size of the resolution being used. To see a few different ways to use this method, you can check out the following great article by Arley McBlain: Responsive Web Above The Fold