/* Example: .circle { @include circle(200px, #999); } */

@mixin circle($size, $color, $display, $zindex: 0)
{
  background: $color;
  display: $display;
  height: $size;
  line-height: $size;
  width: $size;
  z-index: $zindex;

  border-radius: $size/2;
  -webkit-border-radius: $size/2;
  -moz-border-radius: $size/2;
}