Set date-button default background color.

date-button/index.js

 // ==UserScript==
 // @name        Date Button
 // @namespace   http://hugo.hornquist.se
-// @version     0.1.4
+// @version     0.1.5
 // @author      hugo@lysator.liu.se
 // @match       *://*/*
 // @description Inputs the current date into the current text field.
@@ -110,6 +110,8 @@
         top: 1em;
         left: 1em;
         z-index: 10000;
+		background: lightgray;
+		border: 2px solid black;
     }
     #${btn_id}:focus {
         background: pink;