.center {
  margin: auto;
  width: 600px;
  border: 3px solid #000;
  padding: 10px;
  background: white;
}
.tekst {
  text-align:left; 
  padding:15px;
}
body { 
  background-image: url('images/rubberduckys.jpg');

}
.Rood {
  font-size: 12px;
  font-weight: bolder;
  color: #F00;
}
h3 {
  text-align: center;
}
.blok {
  margin: auto;
  width: 80%;
  border: 3px solid #73AD21;
  padding: 10px;
}