div.background{
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom:0;
  display: flex;
  justify-content: center;
  align-content: center;
}

div.background>img{
  width:20%;
}

.loadingImg>img{
  width:30%;
}

header.foreground{
  position: fixed;
  display: flex;
  justify-content: center;
  left: 0;
  right: 0;
  top: 0;
  z-index: 10;
}

header a img{
  width:50vw;
}

@media (max-width: 600px) {
  header a img{
    width:90vw;
  }
}