body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #fbc2eb, #a6c1ee); /* pastel pink -> blue */
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #333;
  }
  
  .container {
    background: #ffffffcc; /* putih transparan */
    padding: 30px 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    border: 2px solid #e3d7ff;
    backdrop-filter: blur(10px);
  }
  
  h1 {
    margin-bottom: 20px;
    color: #6a5acd; /* pastel purple */
    letter-spacing: 1px;
  }
  
  #display {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 20px;
    color: #444;
    background: #f8f9fa;
    padding: 15px 25px;
    border-radius: 12px;
    border: 2px solid #d6c7ff;
    display: inline-block;
  }
  
  .buttons button {
    padding: 12px 24px;
    margin: 5px;
    border: none;
    border-radius: 12px;
    background: #ffa4a7;
    color: #fff;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
  }
  
  .buttons button:hover {
    background: #ff9ba3; /* lebih gelap dikit */
  }
  
  .buttons button:nth-child(2) {
    background: #fdb686; /
  }