.bg-start {
  position: relative;
 /* opacity: 0.65;*/
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;

}
.bg-start {
  background-image: url("https://www.fahrschule-erhardt.de/images/slideshow/death-valley-g3badda41c_1920.jpg");
  min-height: 100%;

}