scss version of purecss button component https://github.com/yui/pure
Usage :
.your-button-class {
@include make-fec-button($color, $background, $color-opacity, $background-opacity, $border:$button-border-default, $border-radius, $padding);
//button size (optional). parameters xs, sm, lg, xl
@include make-fec-button-size(lg);
}