:root {
  --bg: #142a66;
}
html, body {
  height: 100%;
  margin: 0;
}
body {
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
}
main {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  box-sizing: border-box;
}
.center-image {
  max-width: 90%;
  max-height: 90vh;
  width: auto;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}