.triangle-container {
  position: absolute;

  right: -125px;
  bottom: 60px;
  width: 250px;
  height: 250px;
}

@media (min-width: 577px) and (max-width: 991px) {
  .triangle-container {
    right: -100px;
    bottom: 60px;
    width: 200px;
    height: 200px;
  }
}

@media (max-width: 576px) {
  .triangle-container {
    right: -80px;
    bottom: 40px;
    width: 160px;
    height: 160px;
  }
}