* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  display: flex;
  flex-direction: column;       
  justify-content: center;      
  align-items: center;          
  min-height: 100vh;
  background: linear-gradient(to bottom, #2e8b57, #20b2aa);
  font-family: 'Segoe UI', Tahoma, sans-serif;
  color: #033;
}

nav {
  text-align: center;
  margin-bottom: 20px;          
}
nav h1 {
  color: #e0ffff;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  font-size: 1.8rem;
}

#main-page {
  background: rgba(255, 255, 255, 0.9);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  max-width: 400px;
  width: 90%;
  text-align: center;
}

#quiz p {
  margin-bottom: 15px;
  font-size: 1.1rem;
  color: #045;
}
#quiz input[type="text"] {
  width: 100%;
  padding: 10px;
  border: 2px solid #20b2aa;
  border-radius: 6px;
  margin-bottom: 15px;
  font-size: 1rem;
}

#quiz button {
  width: 100%;
  padding: 10px;
  background: #20b2aa;
  border: none;
  border-radius: 6px;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.3s, transform 0.1s;
}
#quiz button:hover {
  background: #3cb371;
}
#quiz button:active {
  transform: scale(0.98);
}

footer {
  text-align: center;
  font-size: 0.85rem;
  margin-top: auto;             
  margin-bottom: 20px;
  color: #e0ffff;
}