reasonably working calibreweb thing

CalibreWebCompanion/library/static/css/styles.css

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+ /* Fixed sidenav, full height */
+ .sidenav {
+    height: 100%;
+    width: 200px;
+    position: fixed;
+    z-index: 1;
+    top: 0;
+    left: 0;
+    background-color: #111;
+    overflow-x: hidden;
+    padding-top: 20px;
+  }
+  
+  /* Style the sidenav links and the dropdown button */
+  .sidenav a, .dropdown-btn {
+    padding: 6px 8px 6px 16px;
+    text-decoration: none;
+    font-size: 20px;
+    color: #818181;
+    display: block;
+    border: none;
+    background: none;
+    width:100%;
+    text-align: left;
+    cursor: pointer;
+    outline: none;
+  }
+  
+  /* On mouse-over */
+  .sidenav a:hover, .dropdown-btn:hover {
+    color: #f1f1f1;
+  }
+  
+  /* Main content */
+  .main {
+    margin-left: 200px; /* Same as the width of the sidenav */
+    font-size: 20px; /* Increased text to enable scrolling */
+    padding: 0px 10px;
+  }
+  
+  /* Add an active class to the active dropdown button */
+  .active {
+    background-color: green;
+    color: white;
+  }
+  
+  /* Dropdown container (hidden by default). Optional: add a lighter background color and some left padding to change the design of the dropdown content */
+  .dropdown-container {
+    display: none;
+    background-color: #262626;
+    padding-left: 8px;
+  }
+  
+  /* Optional: Style the caret down icon */
+  .fa-caret-down {
+    float: right;
+    padding-right: 8px;
+  } 

CalibreWebCompanion/library/static/js/nav.js

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+var dropdown = document.getElementsByClassName("dropdown-btn");
+var i;
+
+for (i = 0; i < dropdown.length; i++) {
+  dropdown[i].addEventListener("click", function() {
+    this.classList.toggle("active");
+    var dropdownContent = this.nextElementSibling;
+    if (dropdownContent.style.display === "block") {
+      dropdownContent.style.display = "none";
+    } else {
+      dropdownContent.style.display = "block";
+    }
+  });
+}