These two images are pause-buttons for a program. The first one shows the button in its default state and the second one when it is being focused on.
I am wondering how the person, who made these buttons, did the focus effect? I looked all over the Internet but couldn't find a tutorial or a hint on how to do something like that.
I recreated the first button with Inkscape. It has a background layer (the gray background as seen in the first picture ) and a button layer which contains the pause symbol (just two rectangles). But now I am clueless on how to proceed.
I hope I am in the right place with my question. Also if this is somehow not possible with Inkscape, I can only use Gimp. I have no photoshop :(