@import url('https://fonts.googleapis.com/css2?family=Martian+Mono:wdth@100.4&display=swap');

body {
cursor: crosshair;
font-family: 'Martian Mono', monospace !important;
} 

#con1 {
  background-image: url("https://www.gustaf-ernst.de/con1.gif");
  background-size: cover;
  min-height: 69vh;
}
#con2 {
  background-image: url("https://gustaf-ernst.de/ita/6.JPG");
  background-size: cover;
  min-height: 430px;
}
#con3 {
  background-image: url("https://gustaf-ernst.de/ita/1.JPG");
  background-size: cover;
  min-height: 440px;
}

#con5 {
	background-image: url("https://gustaf-ernst.de/data/gif2.gif");
    background-size: cover;
    min-height: 470px;
}

.keinU {
  text-decoration: none !important;
  color: black;
}

.oben {
  position: fixed;
  top: 210px;
  width: 70%;
  left: 50%;
  pointer-events: none;
  z-index: 1;
  transform: translateX(-50%);
}

<!--   background-image: url("https://images.squarespace-cdn.com/content/v1/559dbbb5e4b064657baefaaf/1471244948809-9WHG6IYAG4NHZYO3KM15/david-choe-thumbs-up-season-4.gif"); -->