Update examples, add css

examples/window_zoom.rs

@@ -1,3 +1,7 @@
+//! Adjust the zoom of a desktop app
+//!
+//! This example shows how to adjust the zoom of a desktop app using the webview.zoom method.
+
 use dioxus::prelude::*;
 
 fn main() {
@@ -8,6 +12,8 @@ fn app() -> Element {
     let mut level = use_signal(|| 1.0);
 
     rsx! {
+        h1 { "Zoom level: {level}" }
+        p { "Change the zoom level of the webview by typing a number in the input below."}
         input {
             r#type: "number",
             value: "{level}",