.main-container {
  position: relative;
}
.main-container .btn {
  position: absolute;
  box-sizing: border-box;
  display: block;
}
.main-container .btn1 {
  width: 690rem;
  height: 95rem;
  left: 48%;
  transform: translateX(-50%);
  top: 3100rem;
}
.main-container .btn2 {
  width: 660rem;
  height: 95rem;
  left: 50%;
  transform: translateX(-50%);
  top: 20400rem;
}
.main-container .btn3 {
  width: 530rem;
  height: 95rem;
  left: 50%;
  transform: translateX(-50%);
  top: 21030rem;
}