It's up to the designer. But as long as it's used consistently through the design and it's different enough from other elements, your users won't have any issue

It's up to the designer. But as long as it's used consistently through the design and it's different enough from other elements, your users won't have any issues. Either one of these would work: http://jsfiddle.net/5u2j549q/ http://jsfiddle.net/5u2j549q/