Fix left sidebar display with proper width and positioning

custom.css

@@ -1,16 +1,37 @@
 /* Custom styling for IT Learning Notes */
 
-/* Show the left navigation sidebar but modify styling */
+/* Show the left navigation sidebar and ensure it displays properly */
 .sidebar {
     display: block !important;
-    width: auto !important;
     visibility: visible !important;
+    width: 300px !important;
+    min-width: 300px !important;
+    max-width: 300px !important;
+    position: fixed !important;
+    left: 0 !important;
+    top: 0 !important;
+    bottom: 0 !important;
+    height: 100% !important;
+    overflow-y: auto !important;
+    z-index: 10 !important;
     background-color: rgba(245, 245, 247, 0.95) !important;
     border-right: 1px solid #e1e4e8 !important;
 }
 
 .sidebar-scrollbox {
     padding: 10px !important;
+    height: auto !important;
+    overflow-y: auto !important;
+}
+
+/* Fix main content positioning to accommodate proper sidebar */
+#content {
+    margin-left: 300px !important;
+    padding-left: 15px !important;
+}
+
+body {
+    overflow-x: hidden !important;
 }
 
 /* Hide the floating right-side table of contents - using more specific and aggressive rules */
@@ -45,7 +66,7 @@ aside.sidebar-right,
 
 /* Make content take up appropriate width */
 .content-wrap {
-    margin-left: auto !important;
+    margin-left: 300px !important;
     margin-right: auto !important;
     max-width: calc(100% - 300px) !important;
     padding: 0 30px !important;
@@ -62,6 +83,23 @@ article,
     padding-right: 0 !important;
 }
 
+/* Fix theme-specific sidebar issues */
+.light .sidebar,
+.rust .sidebar,
+.coal .sidebar,
+.navy .sidebar,
+.ayu .sidebar {
+    display: block !important;
+    width: 300px !important;
+    visibility: visible !important;
+}
+
+/* Ensure menu button works with sidebar */
+#menu-bar {
+    z-index: 11 !important;
+    position: relative !important;
+}
+
 /* Improve chapter navigation */
 .chapter {
     line-height: 1.3 !important;
@@ -217,11 +255,6 @@ th {
     display: block !important;
 }
 
-/* Ensure main menu button is visible */
-#menu-bar {
-    z-index: 10 !important;
-}
-
 /* Make menu button more visible for navigation */
 #menu-bar i {
     font-size: 1.5em !important;