body {
    font-family: sans-serif;
  }
  
  header {
    background-color: #333;
    color: #fff;
    padding: 20px;
  }
  
  h1 {
    font-size: 24px;
  }
  
  section.acao {
    text-align: center;
  }
  
  section.conteudo {
    margin-top: 20px;
  }
  
  a {
    text-decoration: none;
    color: #000;
  }