diff --git a/src/formula.rs b/src/formula.rs
index 179fe40..ca4e186 100644
--- a/src/formula.rs
+++ b/src/formula.rs
@@ -31,10 +31,15 @@ impl Formula {
         self.display_recursion(0, vec![&self.tree]);
     }
     fn display_recursion(&self, indent_level: u8, nodes: Vec<&Node>) {
-        for node in nodes {
+        for i in 0..nodes.len() {
+            let node = nodes[i];
             if indent_level != 0 {
-                for _ in 0..(indent_level) {
-                    print!("|\t");
+                for j in 0..(indent_level) {
+                    if j == indent_level - 1 {
+                        print!("|__________");
+                    } else {
+                        print!("           ");
+                    }
                 }
             }
             println!("{node}");