:root {
  --colorPrincipal: #3c498f;
}

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  font-family: Helvetica, sans-serif;
}

footer {
  background-color: var(--colorPrincipal);
  text-align: center;
}

.menu a {
  text-decoration: none;
  color: #ffffff;
  margin: 0.5rem;
  font-size: 1.2rem;
  float: left;
}

body {
  color: #ffffff;
}

.menu a:hover {
  color: #000000;
}

.nosotros {
  display: block;
  margin: 2rem auto 0 auto;
  width: 45%;
}

header {
  background-image: url(../imagenes/hero.png);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: top center;
  height: 100%;
  padding-bottom: 1rem;
  position: relative;
}

@media (min-width: 1281px) {
  header {
    padding-bottom: 45rem;
  }
  nosotros {
    padding-bottom: 45rem;
  }

  .menu {
    width: 100%;
  }
}

@media (max-width: 1280px) {
  header {
    padding-bottom: 30rem;
  }
  .nosotros {
    width: 80%;
  }
}

@media (max-width: 560px) {
  header {
    padding-bottom: 14rem;
  }
  .menu a {
    font-size: 0.75em;
  }
  footer p {
    font-size: 0.75em;
  }
}