diff --git a/public/styles.scss b/public/styles.scss
index 46fde96..5ec6c25 100644
--- a/public/styles.scss
+++ b/public/styles.scss
@@ -24,7 +24,7 @@ body {
 header {
   display: flex;
   align-items: center;
-  justify-content: end;
+  justify-content: space-between;
 }
 
 header > select {
diff --git a/src/calc.rs b/src/calc.rs
index 9dc6038..4a51aed 100644
--- a/src/calc.rs
+++ b/src/calc.rs
@@ -55,6 +55,23 @@ pub fn hyper_geometric(
     }
 }
 
+#[derive(Default)]
+pub struct BinomialProb {
+    pub exactly: f64,
+    pub less_than: f64,
+    pub less_or_equal: f64,
+    pub greater_than: f64,
+    pub greater_or_equal: f64,
+}
+
+pub fn binomial(
+    success_probability: f64,
+    trials_number: u8,
+    successes_number: u8,
+) -> Option<BinomialProb> {
+    None
+}
+
 /// Computes the probability of drawing exactly `sample_successes` in a sample of `sample_size`
 /// from a population of size `population_size` and `successes` total successes in the population.
 ///
diff --git a/src/components/calculator.rs b/src/components/calculator.rs
index 264b939..58bfc10 100644
--- a/src/components/calculator.rs
+++ b/src/components/calculator.rs
@@ -6,7 +6,7 @@ use leptos::prelude::{
 use leptos::{IntoView, component, view};
 use leptos_fluent::move_tr;
 
-use crate::calc::hyper_geometric;
+use crate::calc::{binomial, hyper_geometric};
 
 #[component]
 pub fn HyperCalculator() -> impl IntoView {
@@ -109,74 +109,60 @@ pub fn HyperCalculator() -> impl IntoView {
             </span>
             <span class="right">{move || display_rounded(result().greater_or_equal)}</span>
         </div>
+        <div>{move_tr!("hyper-description")}</div>
     }
 }
 
 #[component]
 pub fn BinomCalculator() -> impl IntoView {
-    let (population, set_population) = signal(0u8);
-    let (successes, set_successes) = signal(0u8);
-    let (sample, set_sample) = signal(0u8);
-    let (sample_successes, set_sample_successes) = signal(0u8);
+    let (success_probability, set_success_probability) = signal(0f64);
+    let (trials_number, set_trials_number) = signal(0u8);
+    let (successes_number, set_successes_number) = signal(0u8);
     let result = move || {
-        hyper_geometric(
-            population.get(),
-            successes.get(),
-            sample.get(),
-            sample_successes.get(),
+        binomial(
+            success_probability.get(),
+            trials_number.get(),
+            successes_number.get(),
         )
         .unwrap_or_default()
     };
     view! {
         <form>
             <p>
-                <label for="population">{move_tr!("population")}</label>
+                <label for="success_probability">{move_tr!("success-probability")}</label>
                 <input
-                    id="population"
+                    id="success_probability"
                     type="number"
                     min=0
-                    prop:value=population
+                    max=1
+                    prop:value=success_probability
                     on:input:target=move |ev| {
-                        set_population.set(ev.target().value().parse().unwrap_or_default())
+                        set_success_probability.set(ev.target().value().parse().unwrap_or_default())
                     }
                 />
             </p>
             <p>
-                <label for="successes">{move_tr!("successes")}</label>
+                <label for="trials_number">{move_tr!("trials-number")}</label>
                 <input
-                    id="successes"
+                    id="trials_number"
                     type="number"
                     min=0
-                    prop:max=population
-                    prop:value=successes
+                    prop:value=trials_number
                     on:input:target=move |ev| {
-                        set_successes.set(ev.target().value().parse().unwrap_or_default())
+                        set_trials_number.set(ev.target().value().parse().unwrap_or_default())
                     }
                 />
             </p>
             <p>
-                <label for="sample">{move_tr!("sample")}</label>
+                <label for="successes_number">{move_tr!("successes-number")}</label>
                 <input
-                    id="sample"
+                    id="successes_number"
                     type="number"
                     min=0
-                    prop:max=population
-                    prop:value=sample
+                    prop:max=trials_number
+                    prop:value=successes_number
                     on:input:target=move |ev| {
-                        set_sample.set(ev.target().value().parse().unwrap_or_default())
-                    }
-                />
-            </p>
-            <p>
-                <label for="sample_successes">{move_tr!("sample-successes")}</label>
-                <input
-                    id="sample_successes"
-                    type="number"
-                    min=0
-                    prop:max=sample
-                    prop:value=sample_successes
-                    on:input:target=move |ev| {
-                        set_sample_successes.set(ev.target().value().parse().unwrap_or_default())
+                        set_successes_number.set(ev.target().value().parse().unwrap_or_default())
                     }
                 />
             </p>
@@ -184,35 +170,36 @@ pub fn BinomCalculator() -> impl IntoView {
         <div class="results">
             <span class="left">
                 <span>"P(X = "</span>
-                <span>{sample_successes}</span>
+                <span>{successes_number}</span>
                 <span>"): "</span>
             </span>
             <span class="right">{move || display_rounded(result().exactly)}</span>
             <span class="left">
                 <span>"P(X < "</span>
-                <span>{sample_successes}</span>
+                <span>{successes_number}</span>
                 <span>"): "</span>
             </span>
             <span class="right">{move || display_rounded(result().less_than)}</span>
             <span class="left">
                 <span>"P(X ≤ "</span>
-                <span>{sample_successes}</span>
+                <span>{successes_number}</span>
                 <span>"): "</span>
             </span>
             <span class="right">{move || display_rounded(result().less_or_equal)}</span>
             <span class="left">
                 <span>"P(X > "</span>
-                <span>{sample_successes}</span>
+                <span>{successes_number}</span>
                 <span>"): "</span>
             </span>
             <span class="right">{move || display_rounded(result().greater_than)}</span>
             <span class="left">
                 <span>"P(X ≥ "</span>
-                <span>{sample_successes}</span>
+                <span>{successes_number}</span>
                 <span>"): "</span>
             </span>
             <span class="right">{move || display_rounded(result().greater_or_equal)}</span>
         </div>
+        <div>{move_tr!("binom-description")}</div>
     }
 }
 
diff --git a/src/components/common.rs b/src/components/common.rs
index bf1064c..0feac4e 100644
--- a/src/components/common.rs
+++ b/src/components/common.rs
@@ -9,7 +9,7 @@ pub fn Common() -> impl IntoView {
     view! {
         <I18n>
             <header>
-                <a href="/">Home</a>
+                <a href="/">"🏡"</a>
                 <LanguageSelector />
             </header>
             <Outlet />