.fadein img {
  position: fixed;
left: 0;
top: 0;
z-index: 0;
object-fit: cover;
width: 100vw;
height: 100vh;
}
.fadein:after{
background: url(../img/pattern.png)  repeat top left;
content: '';
  position: absolute;
  top: 0; right: 0;
  bottom: 0; left: 0;
  z-index: 98;
}