* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: #0f172a;
  color: #f8fafc;
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

.page {
  min-height: 100vh;
  padding: 24px;
  display: grid;
  place-items: center;
}

.viewer {
  width: min(100%, 1180px);
}

.display-image {
  display: block;
  width: 100%;
  max-height: calc(100vh - 48px);
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
}

@media (max-width: 640px) {
  .page {
    padding: 12px;
  }

  .display-image {
    max-height: calc(100vh - 24px);
  }
}