0_screenshot.markdown

A pure CSS bendy shadow:

I suspect that some trig calculations could make this very general.

1_mixin.scss

@mixin bendy-shadow($width, $angle: 5deg, $color: rgba(#333, 0.5)) {
  position: relative;
  z-index: 1;
  @include box-shadow(0 10px 5px -5px $color);
  &:before {
    content: "";
    position: absolute;
    bottom: 2px;
    left: 10px;
    width: $width / 2;
    height: 10px;
    z-index: -1;
    @include box-shadow(0 10px 10px 1px $color);
    @include rotate(-$angle);
  }
  &:after {
    content: "";
    position: absolute;
    bottom: 2px;
    right: 10px;
    width: $width / 2;
    height: 10px;
    z-index: -1;
    @include box-shadow(0 10px 10px 1px $color);
    @include rotate($angle);
  }
}