bug #1395 Make sure that the sticky form actions display above anythi…

…ng else (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #1395).

Discussion
----------

Make sure that the sticky form actions display above anything else

This fixes #1209.

Commits
-------

8d28ca6 Make sure that the sticky form actions display above anything else

Resources/views/css/easyadmin.css.twig

@@ -394,6 +394,7 @@ button.btn:active {
     height: 85px;
     padding-bottom: 45px;
 {% endif %}
+    z-index: 9999;
 }
 
 {# Field: collection