body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background-color: #000;
  color: #fff;
  padding: 1rem;
}

.titulo {
  font-size: 2rem;
  text-align: center;
  color: white;
}
.titulo1 {
  font-size: 2rem;
  text-align: center;
  color: black;
}

.fila {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
}

.div-1,
.div-2,
.div-3,
.div-4,
.div-5,
.div-6,
.div-7,
.div-8 {
  width: 100%;
  padding: 1rem;
  background-color: #ccc;
}

@media (max-width: 768px) {
  header {
    padding: 0.5rem;
  }

  .fila {
    flex-direction: column;
  }

  .div-1,
  .div-2 {
    width: 100%;
  }

  footer {
    background-color: black;
  }
}