If you do not want to use that image effect on some parts of a page, e.g. on sidebar (first post widget), you can simply exclude that element (image effect). Open your browser debug stuff and find its class Then go to ../themes/gdaynews/js/ and open file jaw.utils.php on line 104 and add there that classes
If you want to change the spoiler image to your own, you will have to need some Image Editor, e.g. we recommend GIMP (we will use GIMP as a default image editor, if you use Photoshop or other image editor, the procedure is the same).
Here is a quick hint! We are going to show you for Reviews (bear in mind that this can be use for e.g. jaw grid as well) Globally you can set these colors in Theme Options->Styling Options->Color Settings->Overlay Gradient Colors or Overlay Colors. Bear in mind that these colors are applied for each another post or