html,
body {
  position: relative;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}
.main {
  position: relative;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}
.preload {
  position: relative;
  width: 100%;
  height: 100%;
  z-index: 1;
  top: 0;
  left: 0;
  overflow: hidden;
}
img {
  display: block;
  width: 100%;
  height: auto;
}