diff --git a/samples/calc-02/index.js b/samples/calc-02/index.js
index 46f7290..cf4ccef 100644
--- a/samples/calc-02/index.js
+++ b/samples/calc-02/index.js
@@ -343,13 +343,16 @@ function closeModeMenu() {
 	}
 }
 
-function openModeMenu() {
-	closeModeMenu();
+function toggleModeMenu() {
+	if (modeMenuEl) {
+		closeModeMenu();
+		return;
+	}
+	closeConstMenu();
 	const rect = modeButton.getBoundingClientRect();
 	modeMenuEl = document.createElement('div');
 	modeMenuEl.className = 'mode-menu';
 	modeMenuEl.style.top = `${rect.bottom + 6 + window.scrollY}px`;
-	modeMenuEl.style.left = `${rect.left + window.scrollX}px`;
 	modeOptions.forEach((mode) => {
 		const button = document.createElement('button');
 		button.type = 'button';
@@ -370,7 +373,7 @@ function openModeMenu() {
 
 modeButton.addEventListener('click', (event) => {
 	event.stopPropagation();
-	openModeMenu();
+	toggleModeMenu();
 });
 
 window.addEventListener('resize', () => {
@@ -432,8 +435,12 @@ function closeConstMenu() {
 	}
 }
 
-function openConstMenu() {
-	closeConstMenu();
+function toggleConstMenu() {
+	if (constMenuEl) {
+		closeConstMenu();
+		return;
+	}
+	closeModeMenu();
 	const rect = constButton.getBoundingClientRect();
 	constMenuEl = document.createElement('div');
 	constMenuEl.className = 'mode-menu';
@@ -461,7 +468,7 @@ function openConstMenu() {
 
 constButton.addEventListener('click', (event) => {
 	event.stopPropagation();
-	openConstMenu();
+	toggleConstMenu();
 });
 
 leftButton.addEventListener('click', () => {});