* {
  margin: 0;
  padding: 0;
}
header {
  color: #fff !important;
  background-color: #009688 !important;
  background-image: url("/images/background/dji_001.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  padding: 1rem;
  text-shadow: 1px 1px 1px black;
}
header img {
  margin: 10px 0 0 10px;
}
header h2,
header p {
  font-weight: 500;
  text-align: center;
}

header p {
  font-size: 20px;
}

nav {
  color: #fff !important;
  background-color: #2196f3 !important;
}

nav ul {
  display: flex;
}

nav ul li {
  list-style: none;
  display: inline-block;
  padding: 10px 15px;
  cursor: pointer;
  font-weight: bold;
}

nav ul li:first-child {
  margin-left: 30px;
}

nav ul li:nth-child(2) {
  margin-left: auto;
  background-color: cadetblue;
}

nav ul li:nth-child(3) {
  margin-left: auto;
}

nav ul li:hover {
  background-color: #ddd;
  color: #2196f3 !important;
}

@media (max-width: 768px) {
  header p {
    display: none;
  }
  nav ul {
    display: none;
  }
}