diff --git a/index.html b/index.html
index a4fadc5..a64c980 100644
--- a/index.html
+++ b/index.html
@@ -40,7 +40,7 @@
 		<div><h1>KV diagram calculator</h1><a href="https://gitlab.kit.edu/uskyk/kv">(source code)</a></div>
 		<div id="main">
 			<div id="settings">
-				<label>Number of variables: <input type="number" min="1" value="3" id="variables"></label><button id="apply-variables">Apply</button>
+				<label>Number of variables: <input type="number" min="1" value="3" id="variables"></label>
 			</div>
 			<p id="hints">
 				Change output specification by scrolling (up => 1, down => 0), typing (=> 1, 0) or deleting (=> -).
diff --git a/src/bin/svg-wasm.rs b/src/bin/svg-wasm.rs
index 7bdbb5b..93ca707 100644
--- a/src/bin/svg-wasm.rs
+++ b/src/bin/svg-wasm.rs
@@ -174,9 +174,9 @@ fn init_settings() {
 	let closure = Closure::wrap(Box::new(|| run()) as Box<dyn FnMut()>);
 	calculate.add_event_listener_with_callback("click", closure.as_ref().unchecked_ref()).unwrap();
 	closure.forget();
-	let apply_count = web!(document).get_element_by_id("apply-variables").unwrap().unchecked_into::<EventTarget>();
+	let count = web!(document).get_element_by_id("variables").unwrap().unchecked_into::<EventTarget>();
 	let closure = Closure::wrap(Box::new(|| update_input_grid(&grid(get_var_number()))) as Box<dyn FnMut()>);
-	apply_count.add_event_listener_with_callback("click", closure.as_ref().unchecked_ref()).unwrap();
+	count.add_event_listener_with_callback("change", closure.as_ref().unchecked_ref()).unwrap();
 	closure.forget();
 }