diff --git a/themes/original/css/common.css.php b/themes/original/css/common.css.php
index 03965b0214..eb721365b9 100644
--- a/themes/original/css/common.css.php
+++ b/themes/original/css/common.css.php
@@ -316,6 +316,7 @@ th.condition {
 td.null {
     font-style: italic;
     text-align: <?php echo $right; ?>;
+    color: #7d7d7d;
 }
 
 table .valueHeader {
diff --git a/themes/pmahomme/css/common.css.php b/themes/pmahomme/css/common.css.php
index 25c626bbf1..c856f04e58 100644
--- a/themes/pmahomme/css/common.css.php
+++ b/themes/pmahomme/css/common.css.php
@@ -618,6 +618,7 @@ tr:last-child td.condition {
 td.null {
     font-style: italic;
     text-align: <?php echo $right; ?>;
+    color: #7d7d7d;
 }
 
 table .valueHeader {