body {
  background-image: url('https://raw.githubusercontent.com/miya7090/mythomagic-source/main/backgrounds/bossfight.gif');
  /* Darken background */
  background-color: rgba(24, 24, 24, 0.5);
  background-blend-mode: darken;
  background-size: cover;
  position: fixed;
  top: 0px;
  left: 0px;
  width: 100vw;
  height: 100vh;
}

/* Force enable scroll bar */
html {
  overflow-y: scroll;
}