body {
  margin: 0;
  padding: 0;
  font-family: 'Fira Sans', sans-serif;
}
header {
  width: 100%;
  top: 0;
  background-color: #747474;
  height: 10%;
}
  header .titulo {
    margin: 0;
    padding-left: 5%;
    font-size: 5vh;
  }
  header .secundario {
    margin: 0;
    padding-left: 5%;
    font-size: 3vh;
  }
div .contenedor {
  /*margin-left: 10%;*/
}
footer {
  position: fixed;
  width: 100%;
  bottom: 0;
  height: 10%;
  background-color: #747474;
}
  footer p {
    padding-left: 5%;
    vertical-align: middle;
  }