diff --git a/docs/example_wasm_bg.wasm b/docs/example_wasm_bg.wasm
index 6e75f2f5..dee00d47 100644
Binary files a/docs/example_wasm_bg.wasm and b/docs/example_wasm_bg.wasm differ
diff --git a/docs/index.html b/docs/index.html
index c42ceb74..9a4070ad 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -16,12 +16,15 @@
         }
 
         body {
-            background: #000000;
+            background: #101010;
         }
 
+        /* Allow canvas to fill entire web page: */
         html,
         body {
             overflow: hidden;
+            margin: 0 !important;
+            padding: 0 !important;
         }
     </style>
 </head>
@@ -80,12 +83,11 @@
         // ----------------------------------------------------------------------------
         var g_mouse_pos = null;
         var g_mouse_down = false;
-        var g_is_touch = false;
+        var g_is_touch = false; // we don't know yet
         var g_scroll_delta_x = 0;
         var g_scroll_delta_y = 0;
 
         function pixels_per_point() {
-            // return 1.0;
             return window.devicePixelRatio || 1.0;
         }
 
@@ -218,7 +220,7 @@
             paint_and_schedule();
         }
     </script>
-    <!-- TODO: make this cover the entire screen, with resize and all -->
+    <!-- We later make this cover the entire screen even when resized -->
     <canvas id="canvas" width="1024" height="1024"></canvas>
 </body>
 
diff --git a/emigui/src/types.rs b/emigui/src/types.rs
index 841d7ea1..ccd44d24 100644
--- a/emigui/src/types.rs
+++ b/emigui/src/types.rs
@@ -46,6 +46,7 @@ pub struct GuiInput {
     pub mouse_released: bool,
 
     /// Current position of the mouse in points.
+    /// None for touch screens when finger is not down.
     pub mouse_pos: Option<Pos2>,
 
     /// How much the mouse moved compared to last frame, in points.
@@ -71,7 +72,7 @@ impl GuiInput {
             .and_then(|new| last.mouse_pos.map(|last| new - last))
             .unwrap_or_default();
         GuiInput {
-            mouse_down: new.mouse_down,
+            mouse_down: new.mouse_down && new.mouse_pos.is_some(),
             mouse_pressed: !last.mouse_down && new.mouse_down,
             mouse_released: last.mouse_down && !new.mouse_down,
             mouse_pos: new.mouse_pos,
diff --git a/example_wasm/src/lib.rs b/example_wasm/src/lib.rs
index ce5a1dc9..31a9a69b 100644
--- a/example_wasm/src/lib.rs
+++ b/example_wasm/src/lib.rs
@@ -91,7 +91,7 @@ impl State {
                 self.emigui.ui(region);
             });
 
-        let bg_color = srgba(16, 16, 16, 255);
+        let bg_color = srgba(0, 0, 0, 0); // Use background css color.
         let (output, batches) = self.emigui.end_frame();
         self.webgl_painter.paint_batches(
             bg_color,