:root {
  --color-black: #000;
  --color-gray: #666;
  --color-white: #fff;
}

html {
  /* hide page scroolbar in Firefox */
  scrollbar-width: none;
}

body {
  background-color: var(--color-black);
  color: var(--color-white);
  display: flex;
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif,
    "Apple Color Emoji", "Segoe UI Emoji";
  margin: 0;

  /* hide page scroolbar in Edge */
  -ms-overflow-style: none;
}

/* hide page scroolbar in WebKit */
body::-webkit-scrollbar {
  display: none;
}

#sis-world {
  margin: auto;
}

.game-container {
  display: flex;
  flex-direction: column;
}

.game {
  /* default fullscreen background color in Safari is white */
  background-color: var(--color-black);

  /* removes gap between `.game` and `.request-fullscreen` */
  display: flex;
}

.game .loading {
  color: var(--color-gray);

  /* do not display loading text until this css file is active */
  display: initial !important;

  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.request-fullscreen {
  align-items: center;
  color: var(--color-gray);
  display: flex;
  justify-content: center;
  height: 2em;
  padding: 0 0.5em;
}

.link {
  cursor: pointer;
  text-decoration: none;
}

@media (hover: hover) {
  .link:hover {
    color: var(--color-white);
  }
}