diff --git a/Sources/Menu Cells/Underline/TitleLabelMenuViewCell.swift b/Sources/Menu Cells/Underline/TitleLabelMenuViewCell.swift
index 584e199..ace9f13 100644
--- a/Sources/Menu Cells/Underline/TitleLabelMenuViewCell.swift	
+++ b/Sources/Menu Cells/Underline/TitleLabelMenuViewCell.swift	
@@ -89,9 +89,9 @@ public class TitleLabelMenuViewCell: PagingMenuViewCell {
         }
     }
     
-    public func calcIntermediateLabelSize(with leftCell: TitleLabelMenuViewCell, percent: CGFloat) -> CGFloat {
-        let diff = (labelWidth - leftCell.labelWidth) * percent
-        return leftCell.labelWidth + diff
+    public func calcIntermediateLabelSize(with currentCell: TitleLabelMenuViewCell, percent: CGFloat) -> CGFloat {
+        let diff = (labelWidth - currentCell.labelWidth) * abs(percent)
+        return currentCell.labelWidth + diff
     }
     
     public required init?(coder aDecoder: NSCoder) {
diff --git a/iOS Sample/iOS Sample/SimpleViewController.swift b/iOS Sample/iOS Sample/SimpleViewController.swift
index 9f6cc47..7547db3 100644
--- a/iOS Sample/iOS Sample/SimpleViewController.swift	
+++ b/iOS Sample/iOS Sample/SimpleViewController.swift	
@@ -115,6 +115,13 @@ extension SimpleViewController: PagingMenuViewControllerDelegate {
     func menuViewController(viewController: PagingMenuViewController, didSelect page: Int, previousPage: Int) {
         contentViewController.scroll(to: page, animated: true)
     }
+    
+    func menuViewController(viewController: PagingMenuViewController, willAnimateFocusViewTo index: Int, with coordinator: PagingMenuFocusViewAnimationCoordinator) {
+        setFocusViewWidth(index: index)
+        coordinator.animateFocusView { [weak self] coordinator in
+            self?.focusView.layoutIfNeeded()
+        } completion: { _ in }
+    }
 }
 
 extension SimpleViewController: PagingContentViewControllerDelegate {
@@ -123,12 +130,23 @@ extension SimpleViewController: PagingContentViewControllerDelegate {
         adjustfocusViewWidth(index: index, percent: percent)
     }
     
+    // TODO:- needs refactering
     func adjustfocusViewWidth(index: Int, percent: CGFloat) {
-        guard let leftCell = menuViewController.cellForItem(at: index) as? TitleLabelMenuViewCell,
-            let rightCell = menuViewController.cellForItem(at: index + 1) as? TitleLabelMenuViewCell else {
+        let adjucentIdx = percent < 0 ? index - 1 : index + 1
+        guard let currentCell = menuViewController.cellForItem(at: index) as? TitleLabelMenuViewCell,
+            let adjucentCell = menuViewController.cellForItem(at: adjucentIdx) as? TitleLabelMenuViewCell else {
+            return
+        }
+        focusView.underlineWidth = adjucentCell.calcIntermediateLabelSize(with: currentCell, percent: percent)
+    }
+    
+    
+    // TODO:- needs refactering
+    func setFocusViewWidth(index: Int) {
+        guard let cell = menuViewController.cellForItem(at: index) as? TitleLabelMenuViewCell else {
             return
         }
-        focusView.underlineWidth = rightCell.calcIntermediateLabelSize(with: leftCell, percent: percent)
+        focusView.underlineWidth = cell.labelWidth
     }
 }