.header {
  padding: 60px;
  text-align: center;
  background: #90CF8E;
  color: white;
  font-size: 30px;
}

p {
  font-family: Arial, Helvetica, sans-serif;
}

h1 {
  font-family: Arial, Helvetica, sans-serif;
}

section {
  margin: auto;
  width: 50%;
  border: 3px solid #A7DCA5;
  padding: 10px;
}

body {
  background-color: #C6EDC3;
}
  
  
section {
  background-color: white;
}

.topnav {
  background-color: #026b45;
  overflow: hidden;
}

.topnav a {  
font-family: Arial, Helvetica, sans-serif;
}

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

.topnav a:hover {
  background-color: #028a59;
  color: black;
}

.topnav a.active {
  background-color: #026b45;
  color: black;
}