Use f32 for border_width and border_radius

style/src/rule.rs

@@ -74,7 +74,7 @@ pub struct Style {
     /// The width (thickness) of the rule line.
     pub width: u16,
     /// The radius of the line corners.
-    pub radius: u16,
+    pub radius: f32,
     /// The [`FillMode`] of the rule.
     ///
     /// [`FillMode`]: enum.FillMode.html
@@ -94,7 +94,7 @@ impl StyleSheet for Default {
         Style {
             color: [0.6, 0.6, 0.6, 0.51].into(),
             width: 1,
-            radius: 0,
+            radius: 0.0,
             fill_mode: FillMode::Percent(90.0),
         }
     }