diff --git a/TextChatTranslator/AppDelegate.swift b/TextChatTranslator/AppDelegate.swift
index 1006cf7..f3955dd 100644
--- a/TextChatTranslator/AppDelegate.swift
+++ b/TextChatTranslator/AppDelegate.swift
@@ -134,7 +134,7 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSMenuItemValidation {
   private func openSettings() {
     let openSettings = OpenSettings()
     openSettings.openSettings()
-    NSApp.activate()
+    NSApp.activate(ignoringOtherApps: true)
   }
 #endif
 
diff --git a/TextChatTranslator/Localizable.xcstrings b/TextChatTranslator/Localizable.xcstrings
index ab9fbda..10b5ed0 100644
--- a/TextChatTranslator/Localizable.xcstrings
+++ b/TextChatTranslator/Localizable.xcstrings
@@ -1,6 +1,18 @@
 {
   "sourceLanguage" : "en",
   "strings" : {
+    "%lld pt" : {
+
+    },
+    "Background Color:" : {
+
+    },
+    "Font Size:" : {
+
+    },
+    "Install Translation" : {
+
+    },
     "Quit Text Chat Translator" : {
       "localizations" : {
         "ja" : {
@@ -13,6 +25,9 @@
     },
     "Settings…" : {
 
+    },
+    "Source Language:" : {
+
     },
     "Start Translation" : {
       "localizations" : {
@@ -33,6 +48,12 @@
           }
         }
       }
+    },
+    "Target Language:" : {
+
+    },
+    "Text Color:" : {
+
     }
   },
   "version" : "1.0"
diff --git a/TextChatTranslator/OverlayWindow.swift b/TextChatTranslator/OverlayWindow.swift
index f5fdd01..c6ab47a 100644
--- a/TextChatTranslator/OverlayWindow.swift
+++ b/TextChatTranslator/OverlayWindow.swift
@@ -85,15 +85,18 @@ fileprivate class OverlayContentView: NSView {
 
   @AppStorage("backgroundColor") private var backgroundColor = Color.white
   @AppStorage("textColor") private var textColor = Color.black
+  @AppStorage("fontSize" )private var fontSize = 16
 
   private let textLabel = NSTextField(wrappingLabelWithString: "")
-  private let defaultFont: NSFont = .systemFont(ofSize: 16)
   var leadingMargin: CGFloat = 0 {
     didSet {
       leadingConstraint?.constant = leadingMargin
     }
   }
   private var leadingConstraint: NSLayoutConstraint?
+  private var preferredFont: NSFont {
+    NSFont.systemFont(ofSize: CGFloat(fontSize))
+  }
 
   override init(frame frameRect: NSRect) {
     super.init(frame: frameRect)
@@ -117,7 +120,7 @@ fileprivate class OverlayContentView: NSView {
     textLabel.translatesAutoresizingMaskIntoConstraints = true
     containerView.addSubview(textLabel)
 
-    textLabel.font = defaultFont
+    textLabel.font = preferredFont
     textLabel.textColor = NSColor(textColor)
     textLabel.backgroundColor = .clear
     textLabel.drawsBackground = false
@@ -137,7 +140,7 @@ fileprivate class OverlayContentView: NSView {
     containerSize.width -= leadingMargin
     containerSize.height = .greatestFiniteMagnitude
 
-    var font = defaultFont
+    var font = preferredFont
     var fontSize = font.pointSize
     var boundingRect: CGRect = .infinite
 
diff --git a/TextChatTranslator/SettingsView.swift b/TextChatTranslator/SettingsView.swift
index f8b26b9..cfcb13e 100644
--- a/TextChatTranslator/SettingsView.swift
+++ b/TextChatTranslator/SettingsView.swift
@@ -13,6 +13,7 @@ struct SettingsView: View {
 struct TranslationSettingsView: View {
   @AppStorage("backgroundColor") private var backgroundColor = Color.white
   @AppStorage("textColor" )private var textColor = Color.black
+  @AppStorage("fontSize" )private var fontSize = 16
 
   @AppStorage("sourceLanguage") private var sourceLanguage = "en-Latn-US"
   @AppStorage("targetLanguage") private var targetLanguage = "ja-Jpan-JP"
@@ -27,6 +28,12 @@ struct TranslationSettingsView: View {
     Form {
       ColorPicker("Background Color:", selection: $backgroundColor)
       ColorPicker("Text Color:", selection: $textColor)
+      Picker("Font Size:", selection: $fontSize) {
+        ForEach([4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 28, 30, 32, 34, 36, 40, 44], id: \.self) { (size) in
+          Text("\(size) pt")
+            .tag(size)
+        }
+      }
 
       Divider()
         .padding(.vertical)