#background-container {
  position: fixed;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #fff;
  left: 0;
  top: 0;
  opacity: 0.2;
  z-index: -1;
}

.point {
  position: absolute;
  width: 5px;
  height: 5px;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: 50%;
}

.line {
  position: absolute;
  background-color: rgba(0, 0, 0, 0.5);
  width: 1px;
  height: 100%;
  transform-origin: 0 0;
}