body {
    font-family: Arial, sans-serif;
    background: #000000;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    color: #ffffff;
}




.calculadora {
    background-color: #111;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 0 20px #00ffcc, 0 0 40px #00ffcc;
  }
  
  .pantalla {
    width: 90%;
    padding: 15px;
    font-size: 24px;
    background-color: #000;
    border: 2px solid #00ffcc;
    border-radius: 8px;
    color: #00ffcc;
    margin-bottom: 20px;
    text-align: right;
    box-shadow: inset 0 0 10px #00ffcc;
  }
  
  .fila {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
  }
  
  .boton-vivo {
    flex: 1;
    margin: 5px;
    padding: 15px 0;
    color: #fff;
    background-color: transparent;
    border: 2px solid #00ffcc;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 0 10px #00ffcc, 0 0 20px #00ffcc;
    cursor: pointer;
  }
  
  .boton-vivo:hover {
    background-color: #00ffcc;
    color: #000;
    box-shadow: 0 0 15px #00ffcc, 0 0 40px #00ffcc;
    border-color: #00ffcc;
  }

  .titulo {
    color: #00ffcc;
    text-align: center;
    font-size: 32px;
    margin-bottom: 20px;
    text-shadow: 0 0 10px #00ffcc, 0 0 20px #00ffcc;
    font-weight: bold;
  }