SONAR-13943 Hotspots filter dropdowns truncated for anonymous users

server/sonar-web/src/main/js/app/theme.js

@@ -192,6 +192,7 @@ module.exports = {
     // ui elements
     pageMainZIndex: '50',
     pageSideZIndex: '51',
+    pageHeaderZIndex: '55',
 
     globalBannerZIndex: '60',
 

server/sonar-web/src/main/js/apps/security-hotspots/styles.css

@@ -24,7 +24,7 @@
 #security_hotspots .filter-bar {
   position: fixed;
   background-color: var(--barBackgroundColor);
-  z-index: var(--pageSideZIndex);
+  z-index: var(--pageHeaderZIndex);
   left: 0;
   right: 0;
 }