.slide-img-box .slides .slider1 {
    background-image: url(../img/slider1.jpg);
}
.slide-img-box .slides .slider2 {
    background-image: url(../img/slider2.jpg);
}
.slide-img-box .slides .slider3 {
    background-image: url(../img/slider3.jpg);
}
.slide-img-box .slides .slider4 {
    background-image: url(../img/slider4.jpg);
}
@media screen and (max-width: 480px) {
    .slide-img-box .slides .slider1 {
        background-image: url(../img/mobile/slider1m.jpg);
    }
    .slide-img-box .slides .slider2 {
        background-image: url(../img/mobile/slider2m.jpg);
    }
    .slide-img-box .slides .slider3 {
        background-image: url(../img/mobile/slider3m.jpg);
    }
    .slide-img-box .slides .slider4 {
        background-image: url(../img/mobile/slider4m.jpg);
    }
}
.section-image {
    background: url(../img/loading.gif) no-repeat center center;
}