. {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, 
body {
  width: 100%;
  min-height: 100%;
  background-color: #000;
  font-family: Arial, Helvetica, sans-serif;
}

.pagina-principal {
  width: 100%;
  min-height: 100vh;
  background-color: #000;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 20px;
}

.banner-central {
  width: 100%;
  max-width: 1400px;

  display: flex;
  align-items: center;
  justify-content: center;
}

.imagem-principal {
  width: 100%;
  height: auto;
  display: block;

  border-radius: 4px;
}

/* Ajuste para celulares */
@media (max-width: 768px) {
  .pagina-principal {
    padding: 10px;
  }

  .imagem-principal {
    border-radius: 0;
  }
}