.d3__img1 {
  background: url('../img/content/slider_1_start/slide_1.jpg') no-repeat;
  background-size: cover;
}

.d3__img2 {
  background: url('../img/content/slider_1_start/slide_2.jpg') no-repeat;
  background-size: cover;
}

.d3__img3 {
  background: url('../img/content/slider_1_start/slide_3.jpg') no-repeat;
  background-size: cover;
}

.d4 .d3__img1 {
  background: url('../img/content/slider_2_start/slide_1.jpg') no-repeat;
  background-size: cover;
}

.d4 .d3__img2 {
  background: url('../img/content/slider_2_start/slide_2.jpg') no-repeat;
  background-size: cover;
}

.d4 .d3__img3 {
  background: url('../img/content/slider_2_start/slide_3.jpg') no-repeat;
  background-size: cover;
}