Progress Button Styles is a set of flat and 3D progress button styles where the button itself serves as a progress indicator. 3D styles are used for showing the progress indication on one side of the button while rotating the button in perspective.
Please note that they are using transitions on pseudo-elements which are still not supported in some browsers (e.g. Safari and Mobile Safari). Also note that we need transform-style: preserve-3d support for the 3D styles, which neither IE10 nor IE11 support.
License: License Free