.main-bg {
  background-repeat: no-repeat;
  background-position: center;
  background-color: var(--body-background-color);
}

.main-bg.img1 {
  background-image: url('./1.jpg');
}

.main-bg.img2 {
  background-image: url('./2.jpg');
}

.main-bg.img3 {
  background-image: url('./3.jpg');
}

.main-bg.img4 {
  background-image: url('./4.jpg');
}