* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
  }
  
  body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #787b80;
  }
  
  .container {
    background-color: white;
    padding: 2em;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(1, 1, 1, 0.5);
    width: 300px;
    text-align: center;
  }
  
  .control-longitud,
  .opciones,
  .output {
    margin-top: 1.5em;
  }
  
  button {
    padding: 0.5em 1em;
    margin: 0.5em;
    background-color: #007bff;
    border: none;
    color: white;
    border-radius: 5px;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #0056b3;
  }
  
  #contraseña {
    margin-top: 1em;
    padding: 0.7em;
    background-color: #f1f1f1;
    border-radius: 5px;
    word-break: break-word;
  }