diff --git a/docs/index.html b/docs/index.html
index 2846ee8..ad65e0b 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -19,7 +19,7 @@
     <title>6502bench Tools</title>
 </head>
 
-<body>
+<body class="no-sidenav">
 
 <div id="masthead">
     <!-- START: /masthead-incl.html -->
@@ -41,11 +41,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
@@ -58,7 +53,7 @@
     <!-- END: /topnav-incl.html -->
 </div>
 
-<div id="main" class="no-sidenav">
+<div id="main">
 
 <p>6502bench is a code development "workbench" for the 65xx family
 of processors, including the 6502, 65C02, and 65802/65816.  It currently
diff --git a/docs/main.css b/docs/main.css
index 3be9b7c..0444775 100644
--- a/docs/main.css
+++ b/docs/main.css
@@ -103,14 +103,20 @@ kbd.key {
     background-color: #5f5f5f;
 }
 
-/* inline-block seems to help keep the text and icon consistent when
-   expanding and collapsing (vs. inline) */
+/*
+ * Show nothing but HOME initially.  Expand the set as the screen widens.
+ * inline-block seems to help keep the text and icon consistent when
+ * expanding and collapsing (vs. inline).
+ */
 #topnav a {display:inline-block;}
 #topnav a:not(:first-child) {display:none;}
 #topnav a.icon {
     float: right;
     display: block;
 }
+.no-sidenav #topnav a.icon {
+    display: none;      /* no sidenav, no icon */
+}
 #topnav button {
     float: right;
     display: block;
@@ -300,7 +306,7 @@ kbd.key {
         /* make room for sidenav */
         margin-left: 188px;
     }
-    #main.no-sidenav {
+    .no-sidenav #main {
         /* ...or not */
         margin-left: 8px;
     }
diff --git a/docs/sgtutorial/about-disasm.html b/docs/sgtutorial/about-disasm.html
index f2805a6..4abbee4 100644
--- a/docs/sgtutorial/about-disasm.html
+++ b/docs/sgtutorial/about-disasm.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/address-tables.html b/docs/sgtutorial/address-tables.html
index d9c2faf..65fea51 100644
--- a/docs/sgtutorial/address-tables.html
+++ b/docs/sgtutorial/address-tables.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/advanced-topics.html b/docs/sgtutorial/advanced-topics.html
index f5cf7c5..71dfcd1 100644
--- a/docs/sgtutorial/advanced-topics.html
+++ b/docs/sgtutorial/advanced-topics.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/digging-deeper.html b/docs/sgtutorial/digging-deeper.html
index 6759a43..c5b07f7 100644
--- a/docs/sgtutorial/digging-deeper.html
+++ b/docs/sgtutorial/digging-deeper.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/editing-data.html b/docs/sgtutorial/editing-data.html
index fdb4742..58abff0 100644
--- a/docs/sgtutorial/editing-data.html
+++ b/docs/sgtutorial/editing-data.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/extension-scripts.html b/docs/sgtutorial/extension-scripts.html
index f9664ab..8207fcf 100644
--- a/docs/sgtutorial/extension-scripts.html
+++ b/docs/sgtutorial/extension-scripts.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/generating-code.html b/docs/sgtutorial/generating-code.html
index 37a3f2d..41a1cf7 100644
--- a/docs/sgtutorial/generating-code.html
+++ b/docs/sgtutorial/generating-code.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/index.html b/docs/sgtutorial/index.html
index f173c25..4d29cd7 100644
--- a/docs/sgtutorial/index.html
+++ b/docs/sgtutorial/index.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/inline-data.html b/docs/sgtutorial/inline-data.html
index 512e8cc..ffb3ac4 100644
--- a/docs/sgtutorial/inline-data.html
+++ b/docs/sgtutorial/inline-data.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/labels-symbols.html b/docs/sgtutorial/labels-symbols.html
index 2c94972..e7fa725 100644
--- a/docs/sgtutorial/labels-symbols.html
+++ b/docs/sgtutorial/labels-symbols.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/local-variables.html b/docs/sgtutorial/local-variables.html
index e68b1a1..e2feb46 100644
--- a/docs/sgtutorial/local-variables.html
+++ b/docs/sgtutorial/local-variables.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/moving-around.html b/docs/sgtutorial/moving-around.html
index 44bf888..b73c04b 100644
--- a/docs/sgtutorial/moving-around.html
+++ b/docs/sgtutorial/moving-around.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/odds-ends.html b/docs/sgtutorial/odds-ends.html
index 531b015..cf8065c 100644
--- a/docs/sgtutorial/odds-ends.html
+++ b/docs/sgtutorial/odds-ends.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/simple-edits.html b/docs/sgtutorial/simple-edits.html
index 3ed0094..1e2add7 100644
--- a/docs/sgtutorial/simple-edits.html
+++ b/docs/sgtutorial/simple-edits.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/string-formatting.html b/docs/sgtutorial/string-formatting.html
index a73500f..1759bd9 100644
--- a/docs/sgtutorial/string-formatting.html
+++ b/docs/sgtutorial/string-formatting.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/using-sourcegen.html b/docs/sgtutorial/using-sourcegen.html
index e181fba..b378155 100644
--- a/docs/sgtutorial/using-sourcegen.html
+++ b/docs/sgtutorial/using-sourcegen.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/sgtutorial/visualizations.html b/docs/sgtutorial/visualizations.html
index cd14398..01d6192 100644
--- a/docs/sgtutorial/visualizations.html
+++ b/docs/sgtutorial/visualizations.html
@@ -34,11 +34,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
diff --git a/docs/topnav-incl.html b/docs/topnav-incl.html
index 421e74f..e0ecd71 100644
--- a/docs/topnav-incl.html
+++ b/docs/topnav-incl.html
@@ -7,11 +7,6 @@
     </a>
 </nav>
 <script>
-    // If page has no sidenav, don't show the sidenav toggle button.
-    if (document.getElementById("sidenav") == undefined) {
-        $("#topnav-menuicon").hide();
-    }
-
     // Sidenav toggle function.
     //
     // Use a jQuery function to toggle the sidenav bar.  The initial state
