message: Fix build warnings by using DOM std capitalization
diff: @@ -100,7 +100,7 @@ const Background = props => {
  width="560"
  height="315"
  src="https://www.youtube.com/embed/YLAd5hdXR_Q"
  - frameborder="0"
  + frameBorder="0"
  allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
  allowfullscreen
  ></iframe>
  @@ -135,7 +135,7 @@ const Background = props => {
  width="560"
  height="315"
  src="https://www.youtube.com/embed/mOLCgdPw1iA"
  - frameborder="0"
  + frameBorder="0"
  allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
  allowfullscreen
  ></iframe>
  