body {
  margin: 0;
  font-size: 28px;
  font-family: Arial, Helvetica, sans-serif;
}

.header {
  background-image: url("foto/background.jpg");
  background-size: cover;
  background-position-y: 25%;
  text-align: center;
  line-height: 300px;
  height: 300px;
}

.sub-header {
  width: 100%;
  height: 300px;
  background-color: rgba(0,0,0,0.25);
  color: white;
  text-shadow: 1px 1px 2px black;
}

#header, h1 {
  bottom: 0;
  margin:0px;
}

#navbar {
  overflow: hidden;
  background-image: linear-gradient(to right, blue , #00020E);
}

#navbar a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

#navbar a.active {
  background-color: #0080FF;
  color: white;
}

#navbar a:hover, a.active:hover {
  background-color: #B3FDFF;
  color: #00020E;
  transition: 0.3s;
}

.content {
  padding: 50px;
  color: white;
  font-size: 20px;
  padding-left: 10%;
  padding-right: 10%;
}

.sticky {
  position: fixed;
  top: 0;
  width: 100%;
}

.sticky + .content {
  padding-top: 60px;
}

a, a:visited {
  text-decoration: none;
  color: #0080FF;
}

a:hover {
  color: #B3FDFF;
  transition: 0.1s;
}