diff --git a/libreplan-webapp/src/main/webapp/common/css/libreplan_zk.css b/libreplan-webapp/src/main/webapp/common/css/libreplan_zk.css
index a2989ffbb..4e95baf7d 100644
--- a/libreplan-webapp/src/main/webapp/common/css/libreplan_zk.css
+++ b/libreplan-webapp/src/main/webapp/common/css/libreplan_zk.css
@@ -1166,6 +1166,10 @@ tr.z-treerow-over input {
         background-image: none;
 }
 
+tr.z-treerow-over input {
+    background-color: #eff2f6; /* Soft blue */
+        background-image: none;
+}
 
 .timeplot-canvas {
     position:relative;