body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    text-align: center;
  }

  form {
    max-width: 400px;
    margin: 50px auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
  }

  ul {
    list-style: none;
    padding: 0;
  }

  li {
    margin-bottom: 10px;
  }

  input[type="text"] {
    width: calc(100% - 20px);
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
  }

  input[type="password"] {
    width: calc(100% - 20px);
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
  }

  input[type="submit"] {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    border: none;
    border-radius: 4px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
  }

  input[type="submit"]:hover {
    background-color: #0056b3;
  }

  input[type="cerrar_sesion"] {
    width: 100%;
    padding: 10px;
    background-color: #007bff;
    border: none;
    border-radius: 4px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
  }

  input[type="cerrar_sesion"]:hover {
    background-color: #0056b1;
  }

/* Estilos del modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
    padding-top: 60px;
}

.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 20px;
    border: 1px solid #888;
    max-width: 80%;
    width: 50%;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.close {
    color: #aaaaaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}

.checkmark {
    color: #4CAF50;
    font-size: 60px;
    margin-bottom: 20px;
}

/* Estilos para el botón dentro del modal */
.modal-button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.modal-button:hover {
    background-color: #45a049;
}

.version-heading, .copyright-heading {
    font-family: "Arial", sans-serif; 
    font-size: 18px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.copyright-heading {
    color: #666; 
}