diff --git a/Sources/ButtonBarPagerTabStripViewController.swift b/Sources/ButtonBarPagerTabStripViewController.swift
index 36e008d6..d698a57c 100644
--- a/Sources/ButtonBarPagerTabStripViewController.swift
+++ b/Sources/ButtonBarPagerTabStripViewController.swift
@@ -49,9 +49,9 @@ public struct ButtonBarPagerTabStripSettings {
         public var buttonBarRightContentInset: CGFloat?
 
         public var selectedBarBackgroundColor = UIColor.black
-        public var selectedBarHeight: CGFloat = 5
+        public var selectedBarHeight: CGFloat = 2
         public var selectedBarVerticalAlignment: SelectedBarVerticalAlignment = .bottom
-
+        public var selectedBarAlignment: SelectedBarAlignment = .center
         public var buttonBarItemBackgroundColor: UIColor?
         public var buttonBarItemFont = UIFont.systemFont(ofSize: 18)
         public var buttonBarItemLeftRightMargin: CGFloat = 8
diff --git a/Sources/ButtonBarView.swift b/Sources/ButtonBarView.swift
index a204971e..146ee860 100644
--- a/Sources/ButtonBarView.swift
+++ b/Sources/ButtonBarView.swift
@@ -51,7 +51,7 @@ open class ButtonBarView: UICollectionView {
         return bar
     }()
 
-    internal var selectedBarHeight: CGFloat = 4 {
+    internal var selectedBarHeight: CGFloat = 2 {
         didSet {
             updateSelectedBarYPosition()
         }
@@ -99,7 +99,7 @@ open class ButtonBarView: UICollectionView {
         targetFrame.size.height = selectedBar.frame.size.height
         targetFrame.size.width += (toFrame.size.width - fromFrame.size.width) * progressPercentage
         targetFrame.origin.x += (toFrame.origin.x - fromFrame.origin.x) * progressPercentage
-
+        targetFrame.size.width = 76
         selectedBar.frame = CGRect(x: targetFrame.origin.x, y: selectedBar.frame.origin.y, width: targetFrame.size.width, height: selectedBar.frame.size.height)
 
         var targetContentOffset: CGFloat = 0.0
@@ -122,7 +122,7 @@ open class ButtonBarView: UICollectionView {
 
         updateContentOffset(animated: animated, pagerScroll: pagerScroll, toFrame: selectedCellFrame, toIndex: (selectedCellIndexPath as NSIndexPath).row)
 
-        selectedBarFrame.size.width = selectedCellFrame.size.width
+        selectedBarFrame.size.width = 76
         selectedBarFrame.origin.x = selectedCellFrame.origin.x
 
         if animated {
@@ -179,7 +179,7 @@ open class ButtonBarView: UICollectionView {
         case .bottom:
             selectedBarFrame.origin.y = frame.size.height - selectedBarHeight
         }
-
+        selectedBarFrame.size.width = 76
         selectedBarFrame.size.height = selectedBarHeight
         selectedBar.frame = selectedBarFrame
     }
diff --git a/Sources/ButtonCell.xib b/Sources/ButtonCell.xib
index 7025bc70..8f55c8b7 100644
--- a/Sources/ButtonCell.xib
+++ b/Sources/ButtonCell.xib
@@ -1,11 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="12120" systemVersion="16E195" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
-    <device id="retina4_7" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="20037" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
+    <device id="retina4_7" orientation="portrait" appearance="light"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12088"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="20020"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <objects>
@@ -19,7 +17,7 @@
                 <autoresizingMask key="autoresizingMask"/>
                 <subviews>
                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="s7f-rk-sQl">
-                        <rect key="frame" x="22" y="12" width="37.5" height="17"/>
+                        <rect key="frame" x="0.0" y="11.5" width="80" height="17"/>
                         <fontDescription key="fontDescription" type="boldSystem" pointSize="14"/>
                         <color key="textColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                         <nil key="highlightedColor"/>
@@ -37,6 +35,7 @@
             <constraints>
                 <constraint firstItem="tFG-yJ-6Th" firstAttribute="centerY" secondItem="zg4-fX-zUF" secondAttribute="centerY" id="5so-ZP-gRs"/>
                 <constraint firstItem="tFG-yJ-6Th" firstAttribute="centerX" secondItem="zg4-fX-zUF" secondAttribute="centerX" id="9em-NR-hoa"/>
+                <constraint firstItem="s7f-rk-sQl" firstAttribute="leading" secondItem="zg4-fX-zUF" secondAttribute="leading" id="Iol-VH-Zry"/>
                 <constraint firstItem="s7f-rk-sQl" firstAttribute="centerY" secondItem="zg4-fX-zUF" secondAttribute="centerY" id="ZeP-6I-AXE"/>
                 <constraint firstItem="s7f-rk-sQl" firstAttribute="centerX" secondItem="zg4-fX-zUF" secondAttribute="centerX" id="c15-bZ-hPG"/>
             </constraints>