Here is an example of how you can use CSS to provide all the Device Metrics for you and even be able to react using pure CSS in most cases. You can also use javaScript or jQuery top obtain the metrics to help increase performace.
A Pen by Andrew Donelson on CodePen.
One stop shopping. this single page Sign-in page can handle Sign-in, Quick register and recover password. It's ready for HybridAuth (social Login) and a Simple PHP script on the back-end and your off. Enjoy.
A Pen by Andrew Donelson on CodePen.
Combines contact us with social buttons. Slides out from left.
A Pen by Andrew Donelson on CodePen.