diff --git a/examples/basic/src/app.rs b/examples/basic/src/app.rs
index 4ffb903..ce29b04 100644
--- a/examples/basic/src/app.rs
+++ b/examples/basic/src/app.rs
@@ -43,6 +43,9 @@ pub fn App(cx: Scope) -> impl IntoView {
                     <Route path="/button" view=move |cx| view! {cx,
                         <ButtonPage />
                     } />
+                    <Route path="/checkbox" view=move |cx| view! {cx,
+                        <CheckboxPage />
+                    } />
                 </Route>
             </Routes>
             <Routes base="/mobile".to_string()>
diff --git a/examples/basic/src/demo_checkbox.rs b/examples/basic/src/demo_checkbox.rs
deleted file mode 100644
index 02aa3e3..0000000
--- a/examples/basic/src/demo_checkbox.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-use leptos::*;
-use melt_ui::*;
-
-#[component]
-pub fn DemoCheckout(cx: Scope) -> impl IntoView {
-    let (checked, set_checked) = create_signal(cx, false);
-    view! {cx,
-        <div>
-            <Checkbox>
-                "A"
-            </Checkbox>
-            <Checkbox checked=true>
-                "B"
-            </Checkbox>
-            <Checkbox checked=checked on_checked=set_checked>
-                "Click"
-            </Checkbox>
-        </div>
-    }
-}
\ No newline at end of file
diff --git a/examples/basic/src/demo_slider.rs b/examples/basic/src/demo_slider.rs
deleted file mode 100644
index 77e3730..0000000
--- a/examples/basic/src/demo_slider.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-use leptos::*;
-use melt_ui::*;
-
-#[component]
-pub fn DemoSlider(cx: Scope) -> impl IntoView {
-    let (value, set_value) = create_signal(cx, 0.0);
-    let on_value = SignalSetter::map(cx, move |value| {
-        set_value.set(value);
-    });
-    view! { cx,
-        <Slider value=value on_value=on_value/>
-    }
-}
diff --git a/examples/basic/src/main.rs b/examples/basic/src/main.rs
index b0082f8..38ab1fd 100644
--- a/examples/basic/src/main.rs
+++ b/examples/basic/src/main.rs
@@ -1,6 +1,4 @@
 mod app;
-mod demo_checkbox;
-mod demo_slider;
 mod pages;
 
 use app::*;
diff --git a/examples/basic/src/pages/checkbox/mod.rs b/examples/basic/src/pages/checkbox/mod.rs
new file mode 100644
index 0000000..7d63d87
--- /dev/null
+++ b/examples/basic/src/pages/checkbox/mod.rs
@@ -0,0 +1,14 @@
+use leptos::*;
+use melt_ui::*;
+
+#[component]
+pub fn CheckboxPage(cx: Scope) -> impl IntoView {
+    let checked = create_rw_signal(cx, false);
+    view! {cx,
+        <div>
+            <Checkbox checked>
+                "Click"
+            </Checkbox>
+        </div>
+    }
+}
diff --git a/examples/basic/src/pages/components.rs b/examples/basic/src/pages/components.rs
index 25b161f..4e7db06 100644
--- a/examples/basic/src/pages/components.rs
+++ b/examples/basic/src/pages/components.rs
@@ -41,6 +41,7 @@ pub fn ComponentsPage(cx: Scope) -> impl IntoView {
                     <MenuItem key="modal" label="madal" />
                     <MenuItem key="nav-bar" label="nav-bar" />
                     <MenuItem key="button" label="button" />
+                    <MenuItem key="checkbox" label="checkbox" />
                 </Menu>
             </aside>
             <main>
diff --git a/examples/basic/src/pages/home.rs b/examples/basic/src/pages/home.rs
index adb3aa4..8d41b0c 100644
--- a/examples/basic/src/pages/home.rs
+++ b/examples/basic/src/pages/home.rs
@@ -1,5 +1,3 @@
-use crate::demo_checkbox::*;
-use crate::demo_slider::*;
 use leptos::*;
 use leptos_router::use_navigate;
 use melt_ui::*;
@@ -38,9 +36,5 @@ pub fn Home(cx: Scope) -> impl IntoView {
 
             <Progress percentage=count/>
         </Space>
-        <hr />
-        <DemoCheckout />
-        <hr />
-        <DemoSlider />
     }
 }
diff --git a/examples/basic/src/pages/mod.rs b/examples/basic/src/pages/mod.rs
index 032ea51..54f95c8 100644
--- a/examples/basic/src/pages/mod.rs
+++ b/examples/basic/src/pages/mod.rs
@@ -1,4 +1,5 @@
 mod button;
+mod checkbox;
 mod components;
 mod home;
 mod image;
@@ -11,6 +12,7 @@ mod slider;
 mod tabbar;
 
 pub use button::*;
+pub use checkbox::*;
 pub use components::*;
 pub use home::*;
 pub use image::*;
diff --git a/src/card/mod.rs b/src/card/mod.rs
index 7c90f84..6f03842 100644
--- a/src/card/mod.rs
+++ b/src/card/mod.rs
@@ -1,51 +1,75 @@
+use std::rc::Rc;
+
 use crate::{components::*, utils::mount_style::mount_style};
 use leptos::*;
 use stylers::style_sheet_str;
 
+#[slot]
+pub struct CardHeader {
+    children: ChildrenFn,
+}
+
+#[slot]
+pub struct CardHeaderExtra {
+    children: ChildrenFn,
+}
+
+#[slot]
+pub struct CardFooter {
+    #[prop(default = leptos::MaybeSignal::Static(true), into)]
+    if_: MaybeSignal<bool>,
+    children: ChildrenFn,
+}
+
 #[component]
 pub fn Card(
     cx: Scope,
-    #[prop(optional)] title: MaybeSignal<String>,
-    #[prop(default = None)] header: Option<Children>,
-    #[prop(default = None)] header_extra: Option<Children>,
+    #[prop(optional, into)] title: MaybeSignal<&'static str>,
+    #[prop(optional)] card_header: Option<CardHeader>,
+    #[prop(optional)] card_header_extra: Option<CardHeaderExtra>,
     children: Children,
-    #[prop(default = None)] footer: Option<Children>,
+    #[prop(optional)] card_footer: Option<CardFooter>,
 ) -> impl IntoView {
     let class_name = mount_style("card", || style_sheet_str!("./src/card/card.css"));
+
+    let is_header = card_header.is_some();
+    let header = card_header.map_or(None, |v| Some(Rc::new(v)));
+    let header_extra = card_header_extra.map_or(None, |v| Some(Rc::new(v)));
+    // let footer = card_footer.map_or(None, |v| Some(Rc::new(v)));
+    
     view! {
         cx, class=class_name,
         <div class="melt-card">
-            {
-                if header.is_some() || title.get().is_empty() {
-                    view! {
-                        cx, class=class_name,
+                <If cond=MaybeSignal::derive(cx, move || is_header || title.get().is_empty())  >
+                    <Then slot>
                         <div class="melt-card__header">
                             <div class="melt-card__header-content">
-                                <OptionComp value=header bind:header>
+                                <OptionComp value=header.clone() bind:header>
                                     <Fallback slot>
                                         { title.get() }
                                     </Fallback>
-                                    { header(cx) }
+                                    { (header.children)(cx) }
                                 </OptionComp>
                             </div>
-                            <OptionComp value=header_extra bind:header_extra>
+                            <OptionComp value=header_extra.clone() bind:header_extra>
                                 <div class="melt-card__header-extra">
-                                    { header_extra(cx) }
+                                    { (header_extra.children)(cx) }
                                 </div>
                             </OptionComp>
                         </div>
-                    }.into()
-                } else {
-                    None
-                }
-            }
+                    </Then>
+                </If>
             <div class="melt-card__content">
                 { children(cx) }
             </div>
-            <OptionComp value=footer bind:footer>
-                <div class="melt-card__footer">
-                    { footer(cx) }
-                </div>
+            <OptionComp value=card_footer bind:footer>
+                <If cond=footer.if_ >
+                    <Then slot>
+                        <div class="melt-card__footer">
+                            { (footer.children)(cx) }
+                        </div>
+                    </Then>
+                </If>
             </OptionComp>
          </div>
     }
diff --git a/src/checkbox/mod.rs b/src/checkbox/mod.rs
index 27fa241..c43ad87 100644
--- a/src/checkbox/mod.rs
+++ b/src/checkbox/mod.rs
@@ -1,13 +1,12 @@
-use crate::{theme::use_theme, utils::mount_style::mount_style, Theme};
+use crate::{theme::use_theme, utils::mount_style::mount_style, Theme, components::*};
 use leptos::*;
-use stylers::style_sheet_str;
 use leptos_icons::*;
+use stylers::style_sheet_str;
 
 #[component]
 pub fn Checkbox(
     cx: Scope,
-    #[prop(optional, into)] checked: MaybeSignal<bool>,
-    #[prop(optional, into)] on_checked: Option<SignalSetter<bool>>,
+    #[prop(into)] checked: RwSignal<bool>,
     children: Children,
 ) -> impl IntoView {
     let theme = use_theme(cx, Theme::light);
@@ -22,29 +21,20 @@ pub fn Checkbox(
         css_vars.push_str(&format!("--background-color-checked: {bg_color};"));
         css_vars
     });
-    let on_click = move |_| {
-        if let Some(on_checked) = on_checked {
-            on_checked.set(!checked.get());
-        }
-    };
+
     view! {cx, class=class_name,
-        <div class:melt-checkbox=true class=("melt-checkbox--checked", move || checked.get()) style=move || css_vars.get() on:click=on_click>
+        <div class:melt-checkbox=true class=("melt-checkbox--checked", move || checked.get()) style=move || css_vars.get()
+            on:click=move |_| checked.set(!checked.get_untracked())>
             <input class="melt-checkbox__input" type="checkbox" />
             <div class="melt-checkbox__dot">
-                {
-                    move || {
-                        if checked.get() {
-                            view! {cx,
-                                <Icon icon=AiIcon::AiCheckOutlined style="color: white"/>
-                            }.into()
-                        } else {
-                            None
-                        }
-                    }
-                }
+                <If cond=checked>
+                    <Then slot>
+                        <Icon icon=AiIcon::AiCheckOutlined style="color: white"/>
+                    </Then>
+                </If>
             </div>
             <div class="melt-checkbox__label">
-                {children(cx)}
+                { children(cx) }
             </div>
         </div>
     }
diff --git a/src/components/if_comp.rs b/src/components/if_comp.rs
index 94d8c78..ff6d007 100644
--- a/src/components/if_comp.rs
+++ b/src/components/if_comp.rs
@@ -15,7 +15,7 @@ pub struct ElseIf {
 #[component]
 pub fn If(
     cx: Scope,
-    cond: MaybeSignal<bool>,
+    #[prop(into)] cond: MaybeSignal<bool>,
     then: Then,
     #[prop(default=vec![])] else_if: Vec<ElseIf>,
     #[prop(optional)] fallback: Option<Fallback>,
diff --git a/src/components/mod.rs b/src/components/mod.rs
index 4f92fcf..64ae4a0 100644
--- a/src/components/mod.rs
+++ b/src/components/mod.rs
@@ -2,8 +2,8 @@ mod if_comp;
 mod option_comp;
 
 pub use if_comp::*;
-use leptos::*;
 pub use option_comp::*;
+use leptos::*;
 
 #[slot]
 pub struct Fallback {
diff --git a/src/modal/mod.rs b/src/modal/mod.rs
index b3917c5..a60c106 100644
--- a/src/modal/mod.rs
+++ b/src/modal/mod.rs
@@ -1,48 +1,49 @@
 use crate::card::*;
+use crate::components::OptionComp;
 use crate::teleport::*;
 use crate::utils::mount_style::mount_style;
 use leptos::*;
 use stylers::style_sheet_str;
 use leptos_icons::*;
 
+#[slot]
+pub struct ModalFooter {
+    children: ChildrenFn,
+}
+
 #[component]
 pub fn Modal(
     cx: Scope,
-    #[prop(optional, into)] title: Option<MaybeSignal<String>>,
-    children: Children,
-    #[prop(optional)] footer: Option<Children>,
     #[prop(into)] show: RwSignal<bool>,
+    #[prop(optional, into)] title: MaybeSignal<&'static str>,
+    children: Children,
+    #[prop(optional)] modal_footer: Option<ModalFooter>,
 ) -> impl IntoView {
     let class_name = mount_style("modal", || style_sheet_str!("./src/modal/modal.css"));
-    let header = move |cx| {
-        view! {
-            cx, class=class_name,
-            <>
-                <span class="melt-model-title">
-                    {title}
-                </span>
-            </>
-        }
-    };
 
-    let header_extra = move |cx| {
-        view! {
-            cx,
-            <>
-                <span style="cursor: pointer;" on:click=move |_| show.set(false)>
-                    <Icon icon=AiIcon::AiCloseOutlined/>
-                </span>
-            </>
-        }
-    };
     view! {
         cx, class=class_name,
         <Teleport>
             <div class="melt-modal-container" style=move || if show.get() { "" } else { "display: none" }>
                 <div class="melt-modal-mask"></div>
                 <div class="melt-modal-body">
-                    <Card header=Some(Box::new(header)) header_extra=Some(Box::new(header_extra)) footer=footer>
-                        {children(cx)}
+                    <Card>
+                        <CardHeader slot>
+                            <span class="melt-model-title">
+                                { title.get() }
+                            </span>
+                        </CardHeader>
+                        <CardHeaderExtra slot>
+                            <span style="cursor: pointer;" on:click=move |_| show.set(false)>
+                                <Icon icon=AiIcon::AiCloseOutlined/>
+                            </span>
+                        </CardHeaderExtra>
+                        { children(cx) }
+                        <CardFooter slot if_=modal_footer.is_some()>
+                            <OptionComp value=modal_footer.as_ref() bind:footer>
+                                { (footer.children)(cx) }
+                            </OptionComp>
+                        </CardFooter>
                     </Card>
                 </div>
             </div>