diff --git a/themes/bootstrap/scss/_common.scss b/themes/bootstrap/scss/_common.scss
index 23f0aaa712..a477a1af20 100644
--- a/themes/bootstrap/scss/_common.scss
+++ b/themes/bootstrap/scss/_common.scss
@@ -2755,6 +2755,7 @@ input#auto_increment_opt {
 .tooltip {
   background: #333 !important;
   opacity: 0.8 !important;
+  z-index: 9999;
   border: 1px solid #000 !important;
   -moz-border-radius: 0.3em !important;
   -webkit-border-radius: 0.3em !important;
diff --git a/themes/metro/scss/_common.scss b/themes/metro/scss/_common.scss
index 3074177be2..6f30fa8106 100644
--- a/themes/metro/scss/_common.scss
+++ b/themes/metro/scss/_common.scss
@@ -2865,6 +2865,7 @@ form.append_fields_form .tblFooters {
 .tooltip {
   background: #333 !important;
   opacity: 0.8 !important;
+  z-index: 9999;
   border: 1px solid #000 !important;
   font-size: 10px !important;
   font-weight: normal !important;
diff --git a/themes/original/scss/_common.scss b/themes/original/scss/_common.scss
index ab0e460284..884eccecdd 100644
--- a/themes/original/scss/_common.scss
+++ b/themes/original/scss/_common.scss
@@ -2353,6 +2353,7 @@ input#auto_increment_opt {
 .tooltip {
   background: #333 !important;
   opacity: 0.8 !important;
+  z-index: 9999;
   border: 1px solid #000 !important;
   -moz-border-radius: 0.3em !important;
   -webkit-border-radius: 0.3em !important;
diff --git a/themes/pmahomme/scss/_common.scss b/themes/pmahomme/scss/_common.scss
index 3f476fdb5a..4bbc9fd41f 100644
--- a/themes/pmahomme/scss/_common.scss
+++ b/themes/pmahomme/scss/_common.scss
@@ -2767,6 +2767,7 @@ input#auto_increment_opt {
 .tooltip {
   background: #333 !important;
   opacity: 0.8 !important;
+  z-index: 9999;
   border: 1px solid #000 !important;
   -moz-border-radius: 0.3em !important;
   -webkit-border-radius: 0.3em !important;