GUI layout Label Dimension issue

I have 2+ GUI textures that have different dimension. I wanted them to display as full image, but image2 got clipped like this,

Here's the code

 private Texture2D[] pages;
 private int currentPage;    
 private Rect guiScreenRect;
 
     protected void OnGUI()
     {
         if(isActivate)
         {
             float divider = 0.5f;
             
             // left top width height confine to 0-1 pages[currentPage].height*divider
             guiScreenRect = new Rect(0.0f,0.0f,1.0f*divider,0.9f*divider);
             
             guiScreenRect.x *= Screen.width;
             guiScreenRect.width *= Screen.width;
             guiScreenRect.y *= Screen.height;
             guiScreenRect.height *= Screen.height;
             
             GUILayout.BeginArea(guiScreenRect);
             GUILayout.Label(pages[currentPage]);
             GUILayout.EndArea();
         }
     }
 
 public void LoadResourcesBaseonID(string refID)
 {
     currentPage = 0;
     
     int ID = int.Parse(refID);
     string bookTitle = BookData.m_BookData[ID].GetTitle();    
         
     pages = Resources.LoadAll("BookPages/" + bookTitle, typeof(Texture2D)).Cast<Texture2D>().ToArray();
 }