body {
  background: skyblue;
  padding: 0;
  margin: 0;
}
.foreground {
  display: grid;
  height: 95vh;
  width: 100%;
  align-items: center;
  justify-content: center;
}
.foreground iframe {
  width: 30vw;
  height: 40vh;
  box-shadow: 0 0 30px 30px white;
  position: relative;
  z-index: 20;
}
.background {
  position: absolute;
  top: 0;
}
.background * {
  position: absolute;
}
.rainbow {
  top: 2vh;
  left: 0vw;
  width: 35vw;
}
.cloud {
  top: 22vh;
  left: 65vw;
}