Change easing

jet/static/jet/css/_sidebar.scss

@@ -18,7 +18,7 @@
     width: 80%;
     padding-bottom: 0;
     transform: translate3d(-100%, 0, 0);
-    transition: transform $transitions-duration;
+    transition: transform $transitions-duration cubic-bezier(0, 0.5, 0.5, 1);
   }
 
   &.sidebar-opened {