optimize a lot of stuff

css/sidebar.css

@@ -25,6 +25,10 @@ sidebar {
   transition-timing-function: ease-in-out;
 }
 
+.sidebar-item.active {
+
+}
+
 iframe {
   width: calc(100% - 50px - 10px);
   height: calc(100vh - 20px);
@@ -66,6 +70,7 @@ iframe {
 #open-bottom-menu {
   position: absolute;
   bottom: -40px;
+  transition-duration: 0.5s;
   height: 50px;
   left: 0;
   right: 0;