//shadow Level 2
.shadow_level(Level2) {
  .shadow(black, 35%, 0px, 3px, 3px);
}

//shadow
.shadow(@color, @opacity, @displacementX, @displacementY, @blur) {
  @result: fade(@color, @opacity );
  webkit-box-shadow: @displacementX @displacementY @blur @result;
  moz-box-shadow: @displacementX @displacementY @blur @result;
  box-shadow: @displacementX @displacementY @blur @result;
}