.modal {
    display: none;
    position: fixed;
    z-index: 999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
  }

  .modal-conteudo {
    background-color: #fff;
    margin: 15% auto;
    padding: 20px;
    border-radius: 10px;
    width: 80%;
    max-width: 400px;
    text-align: center;
  }

  .modal-conteudo button {
    margin: 10px;
    padding: 10px 20px;
    font-size: 16px;
  }

  .fechar {
    float: right;
    font-size: 24px;
    cursor: pointer;
  }