.page-tech-imaging .sc1 .lens_cam--1 {
    background-image: url(../png/lens-stroke-1.png);
}
.page-tech-imaging .sc1 .lens_cam--2 {
    background-image: url(../png/lens-stroke-2.png);
}
.page-tech-imaging .sc1 .lens_cam--3 {
    background-image: url(../png/lens-stroke-3.png);
}
.page-tech-imaging .sc1 .lens_cam--4 {
    background-image: url(../png/lens-stroke-4.png);
}