h1 {
  color: black;
  font-size: 50px;
}

img {
  width: 180px;
}

H2 {
  color: blue;
}
body {
  margin: 0px;
}

header {
  background-color: blue; 
  padding: 80px;
  font-size: 20px;
  text-align: center;
}

footer {
  background-color: blue; 
  padding: 80px;
  font-size: 20px;
  text-align: center;
}


.topnav {
  background-color: #333;
  overflow: hidden;
}


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


.topnav a:hover {
  background-color: #ddd;
  color: black;
}


.topnav a.active {
  background-color: yellow;
  color: white;
}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
}