added brightness method

Assets/Scenes/HomeScene.unity

@@ -265,6 +265,7 @@ RectTransform:
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Assets/Scripts/HomeMenu/MenuPanelSwitch.cs

@@ -8,7 +8,6 @@ public class MenuPanelSwitch : MonoBehaviour
     [SerializeField] private GameObject MainPanel, JoinPanel, HostPanel, OptionsPanel;
 
     [SerializeField] private Button JoinBtn, HostBtn, OptionsBtn;
-    private Button BackBtn;
 
     private void Start()
     {
@@ -23,7 +22,9 @@ public class MenuPanelSwitch : MonoBehaviour
         HostPanel.SetActive(false);
         OptionsPanel.SetActive(false);
 
+        SetBackgroundBrightness(1f);
         MainPanel.SetActive(true);
+        
     }
 
     public void TurnAllOff()
@@ -32,24 +33,32 @@ public class MenuPanelSwitch : MonoBehaviour
         HostPanel.SetActive(false);
         OptionsPanel.SetActive(false);
         MainPanel.SetActive(false);
+        
     }
 
     public void SwitchJoinPanel()
     {
         TurnAllOff();
+        SetBackgroundBrightness(0.5f);
         JoinPanel.SetActive(true);
     }
 
     public void SwitchHostPanel()
     {
         TurnAllOff();
+        SetBackgroundBrightness(0.5f);
         HostPanel.SetActive(true);
     }
 
     public void SwitchOptionsPanel()
     {
         TurnAllOff();
+        SetBackgroundBrightness(0.5f);
         OptionsPanel.SetActive(true);
     }
 
+    void SetBackgroundBrightness(float b) // 0.0 -> 1 
+    {
+        GetComponent<Image>().color = new Color(b, b, b);
+    }
 }