.parallax1 {
  height: 100vh;
  width: 100vw;
  filter: brightness(100%);
  /* scroll */
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-size: cover;
}
/* You need to use background-image but not "background" */
.parallax1:nth-child(1) {
  background-image: url("../../img/HopMat2021/img3.jpg");
}
.parallax1:nth-child(2) {
  background-image: url("../../img/HopMat2022/hop-mat-2022-img1.jpg");
}
.parallax1:nth-child(3) {
  background-image: url("../../img/HopMat2022/hop-mat-2022-img3.jpg");
}
.parallax1A {
  height: 100vh;
  filter: brightness(100%);
  /* scroll */
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-size: cover;
}
/* You need to use background-image but not "background" */
.parallax1A:nth-child(1) {
  background-image: url('6.jpg');
}
.parallax1A:nth-child(2) {
  background-image: url("14.jpg");
  background-position: bottom;
}
.parallax1A:nth-child(3) {
  background-image: url("15.jpg");
  background-position: bottom;
}
.parallax2 {
  height: 100vh;
  filter: brightness(100%);
  /* scroll */
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-size: cover;
}
/* You need to use background-image but not "background" */
.parallax2:nth-child(1) {
  background-image: url('https://images.unsplash.com/photo-1570828066702-7706220a65f6?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1331&q=80');
}
.parallax2:nth-child(2) {
  background-image: url(https://plus.unsplash.com/premium_photo-1675824592772-4d0f0daa067e?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1469&q=80);
}
.parallax2:nth-child(3) {
  background-image: url(https://images.unsplash.com/photo-1546779375-2d49f85efe78?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1471&q=80);
}