body {
    background: linear-gradient(120deg, #f6d365 0%, #fda085 100%);
    font-family: 'Segoe UI', Arial, sans-serif;
    min-height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
h2 {
    color: #333;
    background: rgba(255,255,255,0.7);
    padding: 16px 32px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    margin-bottom: 32px;
}
#key-table {
    min-width: 320px;
    min-height: 80px;
    background: rgba(255,255,255,0.85);
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.10);
    padding: 24px;
    font-size: 1.2rem;
    color: #444;
    display: flex;
    align-items: center;
    justify-content: center;
}

nav {
  width: 100%;
  background: rgba(255,255,255,0.85);
  box-shadow: 0 2px 8px rgba(67,198,172,0.10);
  padding: 16px 0;
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 32px;
}
nav a {
  color: #2d3a3a;
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}
nav a:hover {
  background: #e0f7fa;
  color: #43c6ac;
}