diff --git a/assets/ArkPetsConfigDefault.json b/assets/ArkPetsConfigDefault.json
index a6282179..4213a6e1 100644
--- a/assets/ArkPetsConfigDefault.json
+++ b/assets/ArkPetsConfigDefault.json
@@ -1,4 +1,5 @@
 {
+    "background_color":"#00000000",
     "behavior_ai_activation":8,
     "behavior_allow_interact":true,
     "behavior_allow_sit":true,
diff --git a/assets/UI/SettingsModule.fxml b/assets/UI/SettingsModule.fxml
index 7b773389..9be5e0a1 100644
--- a/assets/UI/SettingsModule.fxml
+++ b/assets/UI/SettingsModule.fxml
@@ -35,6 +35,10 @@
                     <Label text="高亮描边"/>
                     <JFXComboBox fx:id="configRenderOutline" prefWidth="120.0"/>
                 </HBox>
+                <HBox>
+                    <Label text="背景颜色"/>
+                    <JFXComboBox fx:id="configBackgroundColor" prefWidth="120.0"/>
+                </HBox>
                 <Separator/>
                 <Label styleClass="config-group-title" text="高级设置"/>
                 <HBox>
diff --git a/assets/shaders/OutlineFragment.glsl b/assets/shaders/OutlineFragment.glsl
index 92ce8c0a..9f48f1a7 100644
--- a/assets/shaders/OutlineFragment.glsl
+++ b/assets/shaders/OutlineFragment.glsl
@@ -4,12 +4,14 @@
 
 // Gap Seaming and Ouline Effect Fragment Shader for TwoColorPolygonBatch.
 
-#version 130
+#version 120
 
 varying vec2 v_texCoords;       // From VS
 uniform sampler2D u_texture;    // From TCPB
 uniform vec3 u_outlineColor;    // Required
 uniform float u_outlineWidth;   // Required
+uniform ivec2 u_textureSize;
+uniform float u_alpha;
 
 const float c_alphaLv0 = 0.1;
 const float c_alphaLv1 = 0.5;
@@ -31,7 +33,7 @@ vec4[8] getNeighbors(sampler2D tex, vec2 texCoords, vec2 offset) {
 
 void main() {
     vec4 texColor = texture2D(u_texture, v_texCoords);
-    ivec2 texSize = textureSize(u_texture, 0);
+    ivec2 texSize = u_textureSize;
 
     if (texColor.a < c_alphaLv0) {
         // Outline effect apply on transparent areas
@@ -76,4 +78,6 @@ void main() {
         // No effect apply on other areas
         gl_FragColor = texColor;
     }
+    // Alpha
+    gl_FragColor.a -= (1 - u_alpha);
 }
diff --git a/assets/shaders/TCPBFragment.glsl b/assets/shaders/TCPBFragment.glsl
index e1d08d4a..18c72701 100644
--- a/assets/shaders/TCPBFragment.glsl
+++ b/assets/shaders/TCPBFragment.glsl
@@ -4,7 +4,7 @@
 
 // Common Fragment Shader for TwoColorPolygonBatch.
 
-#version 130
+#version 120
 
 #ifdef GL_ES
     #define LOWP lowp
diff --git a/assets/shaders/TCPBVertex.glsl b/assets/shaders/TCPBVertex.glsl
index 8c38c3b7..cc8b7027 100644
--- a/assets/shaders/TCPBVertex.glsl
+++ b/assets/shaders/TCPBVertex.glsl
@@ -4,7 +4,7 @@
 
 // Common Vertex Shader for TwoColorPolygonBatch.
 
-#version 130
+#version 120
 
 attribute vec4 a_position;
 attribute vec4 a_light;
diff --git a/core/src/cn/harryh/arkpets/ArkChar.java b/core/src/cn/harryh/arkpets/ArkChar.java
index f75cb088..da7647bc 100644
--- a/core/src/cn/harryh/arkpets/ArkChar.java
+++ b/core/src/cn/harryh/arkpets/ArkChar.java
@@ -51,6 +51,8 @@ public class ArkChar {
     protected final AnimClipGroup animList;
     protected final HashMap<AnimStage, Insert> stageInsertMap;
 
+    protected float alpha;
+
     /** Initializes an ArkPets character.
      * @param config The ArkPets Config instance which contains the asset's information and other essential settings.
      * @param scale The scale of the skeleton.
@@ -62,6 +64,7 @@ public ArkChar(ArkConfig config, float scale) {
         camera.setMinInsert(canvasReserveLength - canvasMaxSize);
         batch = new TwoColorPolygonBatch();
         renderer = new SkeletonRenderer();
+        Color backgroundColor = config.getBackgroundColor();
         /* Pre-multiplied alpha shouldn't be applied to models released in Arknights 2.1.41 or later,
         otherwise you may get a corrupted rendering result. */
         renderer.setPremultipliedAlpha(false);
@@ -120,7 +123,7 @@ protected void onApply(AnimData playing) {
             }
         };
         // 6.Canvas setup
-        setCanvas(Color.CLEAR);
+        setCanvas(backgroundColor);
         stageInsertMap = new HashMap<>();
         for (AnimStage stage : animList.clusterByStage().keySet()) {
             // Figure out the suitable canvas size
@@ -227,6 +230,8 @@ protected void renderToBatch() {
         shader2.bind();
         shader2.setUniformf("u_outlineColor", 1f, 1f, 0f);
         shader2.setUniformf("u_outlineWidth", outlineWidth.now());
+        shader2.setUniformi("u_textureSize", passedTexture.getWidth(), passedTexture.getHeight());
+        shader2.setUniformf("u_alpha", alpha);
         batch.setShader(shader2);
         ScreenUtils.clear(0, 0, 0, 0, true);
         batch.begin();
diff --git a/core/src/cn/harryh/arkpets/ArkConfig.java b/core/src/cn/harryh/arkpets/ArkConfig.java
index b7b58bd1..28bbbe2a 100644
--- a/core/src/cn/harryh/arkpets/ArkConfig.java
+++ b/core/src/cn/harryh/arkpets/ArkConfig.java
@@ -11,6 +11,7 @@
 import com.alibaba.fastjson.annotation.JSONField;
 import com.badlogic.gdx.Graphics;
 import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
+import com.badlogic.gdx.graphics.Color;
 
 import java.io.*;
 import java.net.URL;
@@ -38,6 +39,8 @@ public class ArkConfig implements Serializable {
 
 
     // Config items and default values:
+    /** @since ArkPets 3.3 */ @JSONField(defaultValue = "#00000000")
+    public String       background_color;
     /** @since ArkPets 1.0 */ @JSONField(defaultValue = "8")
     public int          behavior_ai_activation;
     /** @since ArkPets 1.0 */ @JSONField(defaultValue = "true")
@@ -111,6 +114,20 @@ public boolean isNewcomer() {
         return isNewcomer;
     }
 
+    /** Returns converted background color.
+     */
+    @JSONField(serialize = false)
+    public Color getBackgroundColor() {
+        Color backgroundColor;
+        if (background_color.matches("^#[0-9a-fA-F]{8}$")) {
+            backgroundColor = Color.valueOf(background_color);
+        } else {
+            Logger.warn("System", "Invalid background color,using transparent");
+            backgroundColor = Color.CLEAR;
+        }
+        return backgroundColor;
+    }
+
     /** Gets the custom ArkConfig object by reading the external config file.
      * If the external config file does not exist, a default config file will be generated.
      * @return An ArkConfig object. {@code null} if failed.
diff --git a/core/src/cn/harryh/arkpets/ArkPets.java b/core/src/cn/harryh/arkpets/ArkPets.java
index 317d7d86..0f0710a5 100644
--- a/core/src/cn/harryh/arkpets/ArkPets.java
+++ b/core/src/cn/harryh/arkpets/ArkPets.java
@@ -18,6 +18,7 @@
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Input;
 import com.badlogic.gdx.InputProcessor;
+import com.badlogic.gdx.graphics.GL20;
 
 import java.util.HashMap;
 import java.util.List;
@@ -61,6 +62,8 @@ public void create() {
 		config = Objects.requireNonNull(ArkConfig.getConfig(), "ArkConfig returns a null instance, please check the config file.");
 		Gdx.input.setInputProcessor(this);
 		Gdx.graphics.setForegroundFPS(config.display_fps);
+		Logger.info("System", "OpenGL Version " + Gdx.gl.glGetString(GL20.GL_VERSION));
+		Logger.info("System", "OpenGL Vendor " + Gdx.gl.glGetString(GL20.GL_VENDOR));
 
 		// 2.Character setup
 		Logger.info("App", "Using model asset \"" + config.character_asset + "\"");
@@ -142,7 +145,7 @@ public void render() {
 		setWindowPos();
 		if (!windowAlpha.isEnded()) {
 			windowAlpha.addProgress(Gdx.graphics.getDeltaTime());
-			hWndMine.setWindowAlpha(windowAlpha.now());
+			cha.alpha = windowAlpha.now();
 		}
 		promiseToolwindowStyle(1);
 
diff --git a/core/src/cn/harryh/arkpets/tray/MemberTrayImpl.java b/core/src/cn/harryh/arkpets/tray/MemberTrayImpl.java
index 43cf3702..476006c6 100644
--- a/core/src/cn/harryh/arkpets/tray/MemberTrayImpl.java
+++ b/core/src/cn/harryh/arkpets/tray/MemberTrayImpl.java
@@ -100,7 +100,7 @@ public void onExit() {
             public void run() {
                 Gdx.app.exit();
             }
-        }, (int)durationNormal.toSeconds());
+        }, (int)durationNormal.toMillis());
     }
 
     @Override
diff --git a/desktop/src/cn/harryh/arkpets/EmbeddedLauncher.java b/desktop/src/cn/harryh/arkpets/EmbeddedLauncher.java
index 9281bbcb..1a0bc290 100644
--- a/desktop/src/cn/harryh/arkpets/EmbeddedLauncher.java
+++ b/desktop/src/cn/harryh/arkpets/EmbeddedLauncher.java
@@ -8,7 +8,6 @@
 import cn.harryh.arkpets.utils.Logger;
 import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application;
 import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration;
-import com.badlogic.gdx.graphics.Color;
 import org.lwjgl.glfw.GLFW;
 import org.lwjgl.glfw.GLFWErrorCallback;
 import org.lwjgl.system.MemoryUtil;
@@ -29,8 +28,9 @@ public static void main (String[] args) {
         ArgPending.argCache = args;
         // Logger
         Logger.initialize(LogConfig.logCorePath, LogConfig.logCoreMaxKeep);
+        ArkConfig appConfig = Objects.requireNonNull(ArkConfig.getConfig());
         try {
-            Logger.setLevel(Objects.requireNonNull(ArkConfig.getConfig()).logging_level);
+            Logger.setLevel(appConfig.logging_level);
         } catch (Exception ignored) {
         }
         new ArgPending(LogConfig.errorArg, args) {
@@ -74,7 +74,7 @@ protected void process(String command, String addition) {
             // Configure window display
             config.setInitialVisible(true);
             config.setTransparentFramebuffer(true);
-            config.setInitialBackgroundColor(Color.CLEAR);
+            config.setInitialBackgroundColor(appConfig.getBackgroundColor());
             // Handle GLFW error
             GLFW.glfwSetErrorCallback(new GLFWErrorCallback() {
                 @Override
diff --git a/desktop/src/cn/harryh/arkpets/controllers/SettingsModule.java b/desktop/src/cn/harryh/arkpets/controllers/SettingsModule.java
index a5dc65fa..991d7e7b 100644
--- a/desktop/src/cn/harryh/arkpets/controllers/SettingsModule.java
+++ b/desktop/src/cn/harryh/arkpets/controllers/SettingsModule.java
@@ -10,6 +10,7 @@
 import cn.harryh.arkpets.guitasks.GuiTask;
 import cn.harryh.arkpets.utils.*;
 import cn.harryh.arkpets.utils.GuiComponents.*;
+import com.badlogic.gdx.graphics.Color;
 import com.jfoenix.controls.*;
 import javafx.concurrent.ScheduledService;
 import javafx.concurrent.Task;
@@ -40,6 +41,8 @@ public final class SettingsModule implements Controller<ArkHomeFX> {
     @FXML
     private JFXComboBox<NamedItem<Integer>> configRenderOutline;
     @FXML
+    private JFXComboBox<NamedItem<Integer>> configBackgroundColor;
+    @FXML
     private JFXCheckBox configWindowTopmost;
     @FXML
     private JFXComboBox<String> configLoggingLevel;
@@ -140,6 +143,15 @@ public String getContent() {
                     app.config.display_render_outline = newValue.value();
                     app.config.save();
                 });
+        new ComboBoxSetup<>(configBackgroundColor).setItems(new NamedItem<>("透明", 0x00000000),
+                        new NamedItem<>("绿色", 0x00ff00ff),
+                        new NamedItem<>("蓝色", 0x0000ffff),
+                        new NamedItem<>("品红色", 0xff00ffff))
+                .selectValue(Color.rgba8888(app.config.getBackgroundColor()), app.config.background_color + "（自定义）")
+                .setOnNonNullValueUpdated((observable, oldValue, newValue) -> {
+                    app.config.background_color = String.format("#%08X", newValue.value());
+                    app.config.save();
+                });
         configWindowTopmost.setSelected(app.config.window_style_topmost);
         configWindowTopmost.setOnAction(e -> {
             app.config.window_style_topmost = configWindowTopmost.isSelected();