.bovencontainer {
  height: 80px;
  background-color: white;
  position: absolute;
  background-attachment: fixed;
}
body {
  padding: 0;
  background-color: green;
  height: 100%;
  margin: 0;
}
.bovenfoto img {
  width: 100vw;
  margin-top: 0vh;
}
.container1 {
  height: 500px;
  background-color: green;
  position: fixed;
}