title: Apply CSS blend-mode to borders only
body: <p>I've been working on a small website, just as an exercise for integration. But as I don't have an extended knowledge of CSS, I do not know if it is possible in the end :</p>
  
  <p>I have in the website a form, with text boxes surrounded by a border, on which I applied a blend mode in Photoshop. Curious to know if it existed in CSS, I quickly tried it out, but got stuck trying to apply mix-blend-mode only on the border.</p>
  
  <p>Is there anyway to do it, or a selector which would allow me to reach only the border and nothing else ?</p>
  
  <p>Thanks for your answers !</p>