diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index 32c7f14b345..13068e123a5 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -171,6 +171,7 @@ body { padding: 0; margin: 0; }
     padding: 5px 10px;
     color: #eee;
     border: solid 1px #333;
+    background: #1e1e1e;
     background: rgba(30,30,30,0.94);
     -moz-border-radius: 0 0 8px 8px;
     -webkit-border-radius: 0 0 8px 8px;
@@ -197,6 +198,7 @@ body { padding: 0; margin: 0; }
     left: 50%;
     margin: -160px -166px;
     border: solid 1px #333333;
+    background: #1e1e1e;
     background: rgba(30,30,30,0.94);
     padding: 22px 32px;
     text-align: left;