PLT-3490 - Fixing RHS issue on Edge (#3474)

webapp/sass/layout/_sidebar-right.scss

@@ -14,13 +14,18 @@
         @include single-transition(background-color, .5s, ease);
         background-color: alpha-color($black, 0);
         height: 100%;
-        left: -100%;
         position: absolute;
         top: 0;
         visibility: hidden;
         width: 300%;
     }
 
+    &.move--left {
+        .sidebar--right__bg {
+            left: -100%;
+        }
+    }
+
     .post-body {
         img {
             max-height: 200px;