title: Set border around imageview with no background in javafx
body: <p>I would like to have a button or a clickable ImageView in my program. When clicked i would like to have a border to appear in a shape of the imageview. This image had no background, but i can't find a way to specify the border's shape. For example:</p>
  
  <p><a href="https://i.stack.imgur.com/qo09K.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qo09K.png" alt="enter image description here"></a></p>
  
  <p>This image has no background, and the border has to be only around the image so no rectangles or circles. Is this possible?</p>