title: Two color background
body: <p>I saw an interesting background on a game and I would like to know how it is made and how can I implement it to my own application.
  <a href="https://i.stack.imgur.com/oBHvF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/oBHvF.png" alt="enter image description here"></a></p>
  
  <p>Here we can see the background. Yellow on the top, blue on the bottom. This is not a simple image, cuz during the gameplay the colors change like a transition.</p>
  
  <p>Also, how can I make a cube look faded like the 1st one from the bottom?</p>
  
  <p>Thanks in advance.</p>