125c125,127
<   $_button_shadow: 0 1px 2px transparentize($shadow_color, 0.03);
---
>   $_button_shadow: inset 0 1px transparentize(white, .95),
>                    inset 0 -1px 0px transparentize(if($c != $bg_color, _border_color($c), $borders_color), .25),
>                          0  1px 2px transparentize($shadow_color, 0.03);
134,135c136
<     background-image: if($variant == 'light', linear-gradient(to top, darken($c, 2%) 2px, $c),
<                                               linear-gradient(to top, darken($c,1%) 2px, $c));
---
>     background-image: image(lighten($c, 7%));