diff --git a/src/app/components/project-map/project-map.component.css b/src/app/components/project-map/project-map.component.css
index 29992d74..e8a6ffe9 100644
--- a/src/app/components/project-map/project-map.component.css
+++ b/src/app/components/project-map/project-map.component.css
@@ -31,10 +31,14 @@ g.node:hover {
   outline: none;
 }
 
-.mat-drawer-content {
-  display: inline !important;
+@-moz-document url-prefix() {
+  /** fixes gray background of drawing menu on Firefox **/
+  .mat-drawer-content {
+    display: inline !important;
+  }
 }
 
+
 .drawer-container {
   height: 72px !important;
   background: transparent;
@@ -92,10 +96,6 @@ g.node:hover {
   background-color: transparent;
 }
 
-.selected {
-  stroke: #0097a7!important;
-}
-
 .project-toolbar .mat-toolbar-multiple-rows {
   width: auto !important;
 }