Right align ~ marker as well

src/main.rs

@@ -265,7 +265,17 @@ impl App {
             .saturating_sub(stack.len() as u16)
             .saturating_sub(2))
         {
-            stack.insert(0, ListItem::new(Span::raw("~")));
+            stack.insert(
+                0,
+                ListItem::new(Span::raw(match self.calculator.calculator_alignment {
+                    CalculatorAlignment::Left => String::from("~"),
+                    CalculatorAlignment::Right => format!(
+                        "{: >width$}",
+                        "~",
+                        width = (chunks[1].width as usize).saturating_sub(2)
+                    ),
+                })),
+            );
         }
 
         let stack = List::new(stack).block(Block::default().borders(Borders::ALL).title("Stack"));