.slider div:first-of-type{
	background-image: url("../img/n2/IMG_7237.jpg");
}
.slider div:nth-of-type(2){
	background-image: url("../img/n2/IMG_7239.jpg");
	animation-delay: 5s;
}
.slider div:last-of-type{
	background-image: url("../img/n2/IMG_7238.jpg");
	animation-delay: 10s;
}