navbar position fixes

src/app/main/main.component.scss

@@ -41,6 +41,7 @@ fuse-main {
 
                 #wrapper {
                     display: flex;
+                    position: relative;
                     flex: 1;
                     overflow: hidden;
 

src/app/main/navbar/navbar.component.scss

@@ -39,6 +39,8 @@ fuse-navbar {
 
     &.folded {
         position: absolute;
+        top: 0;
+        bottom: 0;
 
         &.left-navbar {
             left: 0;