4 files changed, 8 insertions, 50 deletions

diff --git a/src/application.rs b/src/application.rs
index f05d2c4b..01571b56 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -1,5 +1,6 @@
+use crate::theme;
 use crate::window;
-use crate::{Color, Command, Element, Executor, Settings, Subscription};
+use crate::{Command, Element, Executor, Settings, Subscription};
 
 /// An interactive cross-platform application.
 ///
@@ -101,7 +102,7 @@ pub trait Application: Sized {
     type Message: std::fmt::Debug + Send;
 
     /// The theme of your [`Application`].
-    type Theme: Default;
+    type Theme: Default + theme::Definition;
 
     /// The data needed to initialize your [`Application`].
     type Flags;
@@ -167,13 +168,6 @@ pub trait Application: Sized {
         window::Mode::Windowed
     }
 
-    /// Returns the background color of the [`Application`].
-    ///
-    /// By default, it returns [`Color::WHITE`].
-    fn background_color(&self) -> Color {
-        Color::WHITE
-    }
-
     /// Returns the scale factor of the [`Application`].
     ///
     /// It can be used to dynamically control the size of the UI at runtime
@@ -277,10 +271,6 @@ where
         self.0.subscription()
     }
 
-    fn background_color(&self) -> Color {
-        self.0.background_color()
-    }
-
     fn scale_factor(&self) -> f64 {
         self.0.scale_factor()
     }
diff --git a/src/pure/application.rs b/src/pure/application.rs
index 77f68c9e..1306ab6c 100644
--- a/src/pure/application.rs
+++ b/src/pure/application.rs
@@ -1,6 +1,7 @@
 use crate::pure::{self, Pure};
+use crate::theme;
 use crate::window;
-use crate::{Color, Command, Executor, Settings, Subscription};
+use crate::{Command, Executor, Settings, Subscription};
 
 /// A pure version of [`Application`].
 ///
@@ -22,7 +23,7 @@ pub trait Application: Sized {
     type Message: std::fmt::Debug + Send;
 
     /// The theme of your [`Application`].
-    type Theme: Default;
+    type Theme: Default + theme::Definition;
 
     /// The data needed to initialize your [`Application`].
     type Flags;
@@ -88,13 +89,6 @@ pub trait Application: Sized {
         window::Mode::Windowed
     }
 
-    /// Returns the background color of the [`Application`].
-    ///
-    /// By default, it returns [`Color::WHITE`].
-    fn background_color(&self) -> Color {
-        Color::WHITE
-    }
-
     /// Returns the scale factor of the [`Application`].
     ///
     /// It can be used to dynamically control the size of the UI at runtime
@@ -185,10 +179,6 @@ where
         A::mode(&self.application)
     }
 
-    fn background_color(&self) -> Color {
-        A::background_color(&self.application)
-    }
-
     fn scale_factor(&self) -> f64 {
         A::scale_factor(&self.application)
     }
diff --git a/src/pure/sandbox.rs b/src/pure/sandbox.rs
index 207a32bd..a58cace7 100644
--- a/src/pure/sandbox.rs
+++ b/src/pure/sandbox.rs
@@ -1,5 +1,5 @@
 use crate::pure;
-use crate::{Color, Command, Error, Settings, Subscription, Theme};
+use crate::{Command, Error, Settings, Subscription, Theme};
 
 /// A pure version of [`Sandbox`].
 ///
@@ -44,13 +44,6 @@ pub trait Sandbox {
         Theme::default()
     }
 
-    /// Returns the background color of the [`Sandbox`].
-    ///
-    /// By default, it returns [`Color::WHITE`].
-    fn background_color(&self) -> Color {
-        Color::WHITE
-    }
-
     /// Returns the scale factor of the [`Sandbox`].
     ///
     /// It can be used to dynamically control the size of the UI at runtime
@@ -120,10 +113,6 @@ where
         Subscription::none()
     }
 
-    fn background_color(&self) -> Color {
-        T::background_color(self)
-    }
-
     fn scale_factor(&self) -> f64 {
         T::scale_factor(self)
     }
diff --git a/src/sandbox.rs b/src/sandbox.rs
index 16819569..f03562fb 100644
--- a/src/sandbox.rs
+++ b/src/sandbox.rs
@@ -1,5 +1,5 @@
 use crate::{
-    Application, Color, Command, Element, Error, Settings, Subscription, Theme,
+    Application, Command, Element, Error, Settings, Subscription, Theme,
 };
 
 /// A sandboxed [`Application`].
@@ -121,13 +121,6 @@ pub trait Sandbox {
         Theme::default()
     }
 
-    /// Returns the background color of the [`Sandbox`].
-    ///
-    /// By default, it returns [`Color::WHITE`].
-    fn background_color(&self) -> Color {
-        Color::WHITE
-    }
-
     /// Returns the scale factor of the [`Sandbox`].
     ///
     /// It can be used to dynamically control the size of the UI at runtime
@@ -197,10 +190,6 @@ where
         Subscription::none()
     }
 
-    fn background_color(&self) -> Color {
-        T::background_color(self)
-    }
-
     fn scale_factor(&self) -> f64 {
         T::scale_factor(self)
     }