diff --git a/Sources/CodeEditTextView/Controller/STTextViewController.swift b/Sources/CodeEditTextView/Controller/STTextViewController.swift
index 0dbee4f5a..8f8986716 100644
--- a/Sources/CodeEditTextView/Controller/STTextViewController.swift
+++ b/Sources/CodeEditTextView/Controller/STTextViewController.swift
@@ -131,9 +131,12 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
         rulerView.drawSeparator = false
         rulerView.baselineOffset = baselineOffset
         rulerView.font = NSFont.monospacedDigitSystemFont(ofSize: 9.5, weight: .regular)
+        rulerView.selectedLineHighlightColor = theme.lineHighlight
+        rulerView.rulerInsets = STRulerInsets(leading: 20, trailing: 8)
 
         if self.isEditable == false {
             rulerView.selectedLineTextColor = nil
+            rulerView.selectedLineHighlightColor = theme.background
         }
 
         scrollView.verticalRulerView = rulerView
@@ -249,6 +252,7 @@ public class STTextViewController: NSViewController, STTextViewDelegate, ThemeAt
 
         rulerView?.backgroundColor = useThemeBackground ? theme.background : .clear
         rulerView?.separatorColor = theme.invisibles
+        rulerView?.selectedLineHighlightColor = theme.lineHighlight
         rulerView?.baselineOffset = baselineOffset
         rulerView.highlightSelectedLine = isEditable