dimsemenov/Magnific-Popup — pull request #182 by brendanarnold (2013-08-08 11:22:53+00:00)
Title: Extended button reset to override Zurb Foundation presets

Using Zurb Foundation as a base for your project means that buttons have box-shadow and -webkit-box-shadow defined. This means Magnific Popup navigation arrows have a narrow border above them. These extra lines in the reset stop this.