title: Black text - white when on black background
body: <p>I'm creating a game with world where player can move.</p>
  
  <p>And there is some GUI (eq, stats..) which has elements with no background (background is game world).</p>
  
  <p>These elements have black text color, and my question is:</p>
  
  <p>Can this text change to white when background'll be black, or can this text'll be always opposite color than background?</p>