.slide-1 .slide-bg { background-image: url(img/slider-bg/1.png); }
.slide-2 .slide-bg { background-image: url(img/slider-bg/2.png); }
.slide-3 .slide-bg { background-image: url(img/slider-bg/3.png); }
.slide-4 .slide-bg { background-image: url(img/slider-bg/4.png); }

.start-slider .owl-nav {
    color: blue;
}