body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header, footer {
  text-align: center;
}

header {
  background: #333 url('./../img/sentieri.jpg') center center / cover no-repeat;
  color: #fff;
  padding: 2rem 1rem;
}
@media only screen and (min-width: 768px) {
  header { min-height: 250px; padding-top: 3em; }
}

nav {
  background-color: #333;
  padding: 0.5rem;
  position: relative;
}

.hamburger {
  font-size: 1.5rem;
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  display: block;
}
@media only screen and (min-width: 768px) {
  .hamburger { display: none; }
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: none;
  flex-direction: column;
  background-color: #333;
  position: absolute;
  left: 0;
  width: 100%;
}
nav ul.show {
  display: flex;
}
nav li {
  margin: 0;
  border-top: 1px solid #444;
}
nav a {
  text-decoration: none;
  color: #fff;
  padding: 0.5rem 1rem;
  display: block;
}
nav a:hover {
  background: #727272;
}
@media only screen and (min-width: 769px) {
  nav {
	padding: 0;
  }
  nav ul {
    display: flex;
	flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    position: static; /* reset posizione */
    background-color: transparent;
    width: auto;
  }
  nav li {
    border-top: none;
  }
  nav a {
    padding: 0.3rem 0.6rem;
  }
}

main {
  padding: 1rem;
  max-width: 800px;
  margin: auto;
}

footer {
  background: #f2f2f2;
  padding: 1rem;
}
footer p {
  margin: 0;
  font-size: 0.9rem;
}