html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #111827;
}

canvas {
  display: block;
  margin: 0 auto;
}

.startup-error {
  box-sizing: border-box;
  width: min(520px, calc(100% - 32px));
  margin: 20vh auto 0;
  padding: 24px;
  border: 3px solid #7fb33d;
  border-radius: 24px;
  background: #f8f0cf;
  color: #512f24;
  font: 700 18px/1.45 Arial, sans-serif;
  text-align: center;
}

#client-update-required::backdrop {
  background: rgba(15, 23, 42, 0.86);
}

#client-update-required button {
  padding: 14px 22px;
  border: 2px solid #507e22;
  border-radius: 16px;
  background: #d9f99d;
  color: #294712;
  font: inherit;
  cursor: pointer;
}

#client-update-required.client-update-fallback {
  position: fixed;
  inset: 0;
  z-index: 2147483647;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  padding-top: 20vh;
}