fix: align calc mode menu popup styling

samples/calc-01/index.css

@@ -200,6 +200,23 @@ body {
   background: rgba(18, 24, 34, 0.96);
   border: 1px solid rgba(255, 255, 255, 0.08);
   box-shadow: 0 16px 30px rgba(0, 0, 0, 0.35);
+  overflow: hidden;
+}
+
+#modeMenu {
+  left: 0;
+  right: auto;
+  min-width: 100%;
+  margin-right: 0;
+}
+
+.popup-menu {
+  text-align: left;
+}
+
+.popup-menu button {
+  text-align: left;
+  justify-content: flex-start;
 }
 
 .popup-menu[hidden] {