Improve default padding of Button widget

widget/src/button.rs

@@ -63,6 +63,14 @@ impl<'a, Message, Theme, Renderer> Button<'a, Message, Theme, Renderer>
 where
     Renderer: crate::core::Renderer,
 {
+    /// The default [`Padding`] of a [`Button`].
+    pub const DEFAULT_PADDING: Padding = Padding {
+        top: 5.0,
+        bottom: 5.0,
+        right: 10.0,
+        left: 10.0,
+    };
+
     /// Creates a new [`Button`] with the given content.
     pub fn new(
         content: impl Into<Element<'a, Message, Theme, Renderer>>,
@@ -78,7 +86,7 @@ where
             on_press: None,
             width: size.width.fluid(),
             height: size.height.fluid(),
-            padding: Padding::new(5.0),
+            padding: Self::DEFAULT_PADDING,
             clip: false,
             style: Theme::default_style(),
         }