diff --git a/data/style.css b/data/style.css
index 90f6e476732d4a49fe91a4e3e528415820087285..db68cbf76da8dddcf74d994e8d7a58207c089799 100644
--- a/data/style.css
+++ b/data/style.css
@@ -21,21 +21,21 @@
 .selected-section > .section-title {
     font: bold 18;
     color: white;
-    background: #009900;
+    background-color: #009900;
 }
 .section-title {
     font: bold 18;
     color: white;
-    background: #999999;
+    background-color: #999999;
 }
 
 .section-body {
-    background: white;
+    background-color: white;
     margin: 20px;
 }
 
 .selected-section {
-    background: #eeffee;
+    background-color: #eeffee;
     margin: 20px;
 }