+/* http://css-tricks.com/snippets/css/css-box-shadow/
+ * box-shadow:
+ * 1. The horizontal offset of the shadow, positive means
+ * the shadow will be on the right of the box, a negative
+ * offset will put the shadow on the left of the box.
+ * 2. The vertical offset of the shadow, a negative one
+ * means the box-shadow will be above the box, a
+ * positive one means the shadow will be below the box.
+ * 3. The blur radius (optional), if set to 0 the shadow
+ * will be sharp, the higher the number, the more blurred
+ * it will be.
+ * 4. The spread radius (optional), positive values increase
+ * the size of the shadow, negative values decrease the size.
+ * Default is 0 (the shadow is same size as blur).
+ * 5. Colo[u]r
+ */