.sidebar {
   height: 100%;
   width: 16rem;
   position: sticky;
   overflow-x: visible;
   overflow-y: auto;
   padding-top: 0;
   transition: 0.3s;
   background-color: transparent;
 }
 
.relative { position: relative !important; }
.absolute { position: absolute !important; }
.fixed { position: fixed !important; }
.sticky { position: sticky !important; }

@media (min-width: 768px) {
  .sidebar { top: 0 !important; z-index: auto !important; }
}

@media (max-width: 767px) {
  .sidebar { z-index: 50 !important; }
}

 .sidebar a {
   padding: 8px 8px 8px 32px;
   text-decoration: none;
   font-size: 25px;
   color: #818181;
   display: block;
   transition: 0.3s;
 }
 
 .sidebar a:hover {
   color: #f1f1f1;
 }
 
 .sidebar .closebtn {
   /* position: absolute; */
   top: 0;
   right: 25px;
   font-size: 36px;
   margin-left: 50px;
 }
 
 .openbtn {
   font-size: 20px;
   cursor: pointer;
   background-color: #111;
   color: white;
   padding: 10px 15px;
   border: none;
 }
 
 .openbtn:hover {
   background-color: #444;
 }
 
 #main {
   transition: margin-left 0.5s;
   padding: 20px;
 }
 
 @media screen and (max-height: 450px) {
   /* .sidebar { padding-top: 15px; } */
   .sidebar a { font-size: 18px; }
 }

/* Language-specific font stacks */
.lang-en {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", "Noto Sans CJK SC", "Noto Sans CJK TC", sans-serif;
}
.lang-zh-tw {
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "Heiti TC", "WenQuanYi Micro Hei", "Heiti SC", "Helvetica Neue", Arial, sans-serif;
}
.lang-zh-cn {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", "WenQuanYi Micro Hei", "Heiti TC", "Helvetica Neue", Arial, sans-serif;
}

.lang-zh-tw h1, .lang-zh-tw h2, .lang-zh-tw h3, .lang-zh-tw h4, .lang-zh-tw h5, .lang-zh-tw h6,
.lang-zh-cn h1, .lang-zh-cn h2, .lang-zh-cn h3, .lang-zh-cn h4, .lang-zh-cn h5, .lang-zh-cn h6 {
  font-weight: 700;
}