.viewport-notice {
  position: fixed;
  inset: max(16px, env(safe-area-inset-top)) auto auto 50%;
  transform: translateX(-50%);
  z-index: 2147483647;
  box-sizing: border-box;
  width: max-content;
  max-width: calc(100vw - 32px);
  margin: 0;
  padding: 14px 20px;
  border: 1px solid #52647f;
  border-radius: 12px;
  background: #182338;
  color: #fff;
  box-shadow: 0 12px 40px #0007;
  font: 600 14px/1.5 system-ui, sans-serif;
  text-align: center;
  overflow-wrap: anywhere;
  pointer-events: none;
}
.viewport-notice[hidden] { display: none !important; }