[FIX] web_responsive: attachment_viewer is displayed under clock of employees view

web_responsive/static/src/components/attachment_viewer/attachment_viewer.scss

@@ -12,7 +12,7 @@
         }
         .o_AttachmentViewer {
             // On-top of navbar
-            z-index: 10;
+            z-index: 100;
             position: absolute;
             right: 0;
             top: 0;