improve overlay design and fix footer

To fix:
- css split between nav and nav-tree repeated due to mobile
- right overlay needs padding adjustments and resizing for mobile

src/styles/css-config/animations.css

@@ -57,26 +57,6 @@
   }
 }
 
-@keyframes rotateIn {
-  from {
-    transform: rotate(0deg);
-  }
-
-  to {
-    transform: rotate(180deg);
-  }
-}
-
-@keyframes rotateOut {
-  from {
-    transform: rotate(180deg);
-  }
-
-  to {
-    transform: rotate(0deg);
-  }
-}
-
 @keyframes rotateIn90 {
   from {
     transform: rotate(0deg);