diff --git a/ChatTwo/Configuration.cs b/ChatTwo/Configuration.cs
index 669a822..9c5ab7a 100755
--- a/ChatTwo/Configuration.cs
+++ b/ChatTwo/Configuration.cs
@@ -16,6 +16,7 @@ internal class Configuration : IPluginConfiguration {
     public bool CanResize = true;
     public bool ShowTitleBar;
     public float FontSize = 17f;
+    public float WindowAlpha = 1f;
     public Dictionary<ChatType, uint> ChatColours = new();
     public List<Tab> Tabs = new();
 
@@ -29,6 +30,7 @@ internal class Configuration : IPluginConfiguration {
         this.CanResize = other.CanResize;
         this.ShowTitleBar = other.ShowTitleBar;
         this.FontSize = other.FontSize;
+        this.WindowAlpha = other.WindowAlpha;
         this.ChatColours = other.ChatColours.ToDictionary(entry => entry.Key, entry => entry.Value);
         this.Tabs = other.Tabs.Select(t => t.Clone()).ToList();
     }
diff --git a/ChatTwo/Ui/ChatLog.cs b/ChatTwo/Ui/ChatLog.cs
index 164f8d4..e81e7a1 100755
--- a/ChatTwo/Ui/ChatLog.cs
+++ b/ChatTwo/Ui/ChatLog.cs
@@ -96,6 +96,8 @@ internal sealed class ChatLog : IUiComponent {
                - ImGui.GetStyle().ItemSpacing.Y * 4;
     }
 
+    private unsafe ImGuiViewport* _lastViewport;
+
     public unsafe void Draw() {
         var flags = ImGuiWindowFlags.None;
         if (!this.Ui.Plugin.Config.CanMove) {
@@ -110,11 +112,18 @@ internal sealed class ChatLog : IUiComponent {
             flags |= ImGuiWindowFlags.NoTitleBar;
         }
 
+        if (this._lastViewport == ImGuiHelpers.MainViewport.NativePtr) {
+            ImGui.SetNextWindowBgAlpha(this.Ui.Plugin.Config.WindowAlpha);
+        }
+
         if (!ImGui.Begin($"{this.Ui.Plugin.Name}##chat", flags)) {
+            this._lastViewport = ImGui.GetWindowViewport().NativePtr;
             ImGui.End();
             return;
         }
 
+        this._lastViewport = ImGui.GetWindowViewport().NativePtr;
+
         var currentTab = this.Ui.Plugin.Config.SidebarTabView
             ? this.DrawTabSidebar()
             : this.DrawTabBar();
diff --git a/ChatTwo/Ui/SettingsTabs/Display.cs b/ChatTwo/Ui/SettingsTabs/Display.cs
index 32c7b9b..a9a1353 100755
--- a/ChatTwo/Ui/SettingsTabs/Display.cs
+++ b/ChatTwo/Ui/SettingsTabs/Display.cs
@@ -21,7 +21,18 @@ internal sealed class Display : ISettingsTab {
             ImGui.Checkbox("More compact modern layout", ref this.Mutable.MoreCompactPretty);
         }
 
-        ImGui.DragFloat("Font size", ref this.Mutable.FontSize, .0125f, 12f, 36f, "%.1f");
+        ImGui.DragFloat("Font size", ref this.Mutable.FontSize, .0125f, 12f, 36f, $"{this.Mutable.FontSize:N1}");
+        if (ImGui.DragFloat("Window opacity", ref this.Mutable.WindowAlpha, .0025f, 0f, 1f, $"{this.Mutable.WindowAlpha * 100f:N2}%%")) {
+            switch (this.Mutable.WindowAlpha) {
+                case > 1f and <= 100f:
+                    this.Mutable.WindowAlpha /= 100f;
+                    break;
+                case < 0f or > 100f:
+                    this.Mutable.WindowAlpha = 1f;
+                    break;
+            }
+        }
+
         ImGui.Checkbox("Allow moving main window", ref this.Mutable.CanMove);
         ImGui.Checkbox("Allow resizing main window", ref this.Mutable.CanResize);
         ImGui.Checkbox("Show title bar for main window", ref this.Mutable.ShowTitleBar);