Dynamically sized select tick

[bitstarr]

Sorry, i'm too lazy to make a pull request for the following detail.

The .select class uses background-size to size the SVG tick. Use .8rem instead of 12px for a more flexible styling.

BTW i really like this project. It provides a very good styling with minimal foot print.

cheers.

[electerious]

Generally a good idea, but I would say that when we use rem for the select we should also use rem for the background-size of the control. The problem here is that relative units often lead to half pixels. That way the dot in the radio control would look a bit more like a egg.

[bitstarr]

good point