update ui

src/css/header.css

@@ -328,8 +328,7 @@ body {
   }
 
   .navbar-item.is-hoverable:hover .navbar-dropdown {
-    /* display: block; */
-    max-height: 300px; /* Adjust based on content */
+    max-height: 310px;
     opacity: 1;
     visibility: visible;
   }
@@ -402,7 +401,6 @@ body {
     background: var(--navbar-menu-background);
     box-shadow: 0 6px 9px 0 rgba(0, 0, 0, 0.16);
     border-radius: 0 0 0.25rem 0.25rem;
-    /* display: none; */
     top: 100%;
     left: 0;
     min-width: 100%;

src/css/toc.css

@@ -124,7 +124,7 @@
 .chat {
   display: none;
   position: fixed;
-  z-index: 1000;
+  z-index: 1;
   right: 10px;
   bottom: 85px;
   width: 415px;