diff --git a/scss/graphics.scss b/scss/graphics.scss
index e09862e..02b27ac 100644
--- a/scss/graphics.scss
+++ b/scss/graphics.scss
@@ -12,3 +12,12 @@
   /* IE                            */
   -ms-interpolation-mode: nearest-neighbor;
 }
+
+@mixin shadow-border($size, $color, $radius: $size) {
+  box-shadow:
+    -#{$size} -#{$size} $radius $color,
+       $size     $size  $radius $color,
+    -#{$size}    $size  $radius $color,
+       $size  -#{$size} $radius $color
+  ;
+}