css slider background image
.container .slider .slide.slide1 {
background: url(1.jpg);
background-size: cover;
background-position: center;
}
.container .slider .slide.slide2 {
background: url(2.jpg);
background-size: cover;
background-position: center;
}
.container .slider .slide.slide3 {
background: url(3.jpg);
background-size: cover;
background-position: center;
}
.container .slider .slide.slide4 {
background: url(4.jpg);
background-size: cover;
background-position: center;
}