Fix incorrect CSS rule

Change-Id: Id80b7033bd0e544c09bdefeb9de368c19df7ccf9
diff --git a/css/style.css b/css/style.css
index 024c06f..a9169d7 100644
--- a/css/style.css
+++ b/css/style.css
@@ -16,7 +16,7 @@
 
 input[type="radio"]:checked {
     background-color: grey;
-    box-shadow: inset 0 0 0 .1875em #white;
+    box-shadow: inset 0 0 0 .1875em white;
     -webkit-transition: background .15s, box-shadow .1s; 
     transition: background .15s, box-shadow .1s; 
 }