header {
    background-image: url(../assets/building2.jpeg);
    background-position: center;
}
.intro .img {
    background-image: url(../assets/building.jpeg);
    background-position: center top;
}
.products .img.img1 {
    background-image: url(../assets/products/8.jpg);
}

.products .img.img2 {
    background-image: url(../assets/products/9.jpg);
}

.products .img.img3 {
    background-image: url(../assets/products/34.jpg);
}

.products .img.img4 {
    background-image: url(../assets/products/5.jpg);
}