body,
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background-color: rgb(142, 214, 236);
}

.container {
  position: relative;
  width: 100%;
  height: 100%;
}

.square {
  position: absolute;
  width: 10vw;
  height: 10vw;
  max-width: 90px;
  max-height: 90px;
  border-radius: 5px;
  background-color: black;
  opacity: 0.5;
}