.parallax {
  position: relative;
  width: 100%;
  margin: 5em 0;
}

.parallax__image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: auto;
  will-change: transform;
}

.parallax__image_first {
  position: static;
}

.with-wave {
  position: relative;
}

.with-wave::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 100%;
  width: 200%;
  display: block;
  background: url(vzaimno-line.png) center bottom / 100% auto no-repeat;
}

.firefox .with-wave::after {
  width: 100%;
  top: 200%;
}