#lb1 {
	background-image: url(images/1.jpg);
}
#lb2 {
	background-image: url(images/2.jpg);
}
#lb3 {
	background-image: url(images/3.jpg);
}
#lb4 {
	background-image: url(images/4.jpg);
}
#lb5 {
	background-image: url(images/5.jpg);
}
body #lb2:after, body #lb3:after {
    background-color: rgba(100,100,100,0.75);
}