* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: "Times new roman";
  background: url("achtergrond.png") center/cover no-repeat fixed;
}

header {
  background-color: #518F55;
  padding: 30px;
  color: white;
  font-size: 40px;

  display: flex;
  align-items: center;     
  justify-content: center; 
  position: relative;      
}

header img {
  position: absolute;
  left: 80px;   
  width: 100px;  
  height: auto;
}

.topnav {
  background-color: #83CC83;
}

.topnav ul {
  list-style: none;
  margin: 0;
  padding: 0;

  display: flex;
  justify-content: space-around;
}

.topnav li {
  flex: 1;               
  text-align: center;
}

.topnav a {
  display: block;        
  padding: 15px 0;
  text-decoration: none;
  color: #2F3B2F;
  font-weight: bold;
  transition: 0.3s;
}

.topnav a:hover {
  background-color: #518F55;
  color: white;
}

html, body {
  height: 100%;
  margin: 0;
}
.content  {
  min-height: 100vh;
}

.section {
  margin-top: 0px;
	min-height: 100vh;
}

.content {
  flex: 1;
  width: 100%;
  padding: 20px;
	text-align: center;
	font-size: 20px;
}

.content a {
  color: #2F3B2F;      
  text-decoration: none;
  font-weight: bold;
}

.content a:hover {
  color: #518F55;
	cursor: help;
}

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

.section::after {
  content: "";
  display: table;
  clear: both;
}