fix(examples-styling): fixed checkbox and toggler getting hidden behind scrollbar

Column inside scrollable is having Length::Fill so it is taking entire width thus hiding check box and toggler.
Added fixed width to scrollable so Lenth::Fill will be relative to fixed width

examples/styling/src/main.rs

@@ -108,6 +108,7 @@ impl Sandbox for Styling {
             column!["Scroll me!", vertical_space(800), "You did it!"]
                 .width(Length::Fill),
         )
+        .width(300)    
         .height(100);
 
         let checkbox = checkbox(