.zoominheader {
  width:110%;
  height:110%;
min-height:500px;
  text-align:center;
  background: url("https://flamingo-fkk.de/wp-content/uploads/foto-collage-10a.jpg");
  background-size: auto;
  background-attachment: fixed;
  background-repeat: repeat;
  position: relative;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-animation: zoomin 30s ease-in infinite;
  animation: zoomin 30s ease-in infinite;
  transition: all .5s ease-in-out;
  overflow: hidden;
}

/* The innermost element*/
.zoomoutheader {
  width:110%;
  height:110%;
min-height:500px;
  text-align:center;
  background: none;
  -webkit-animation: zoomout 30s ease-in infinite;
  animation: zoomout 30s ease-in infinite;
  transition: all .5s ease-in-out;
  overflow: hidden;
}



/* Zoom in Keyframes */
@-webkit-keyframes zoomin {
  0% {transform: scale(1);}
  50% {transform: scale(1.5);}
  100% {transform: scale(1);}
}
@keyframes zoomin {
  0% {transform: scale(1);}
  50% {transform: scale(1.5);}
  100% {transform: scale(1);}
} /*End of Zoom in Keyframes */

/* Zoom out Keyframes */
@-webkit-keyframes zoomout {
  0% {transform: scale(1);}
  50% {transform: scale(0.67);}
  100% {transform: scale(1);}
}
@keyframes zoomout {
    0% {transform: scale(1);}
  50% {transform: scale(0.67);}
  100% {transform: scale(1);}
}/*End of Zoom out Keyframes */