.mainSlider{
    position:relative;
}
.mainSlider:before{
    position:absolute;
    content:"";
    bottom:3%;
    right: 4%;
    width: 92%;
    height: 30px;
    background: #66B433;
    z-index: 111111;
}
.mainSlider:after{
    position:absolute;
    content:"";
    bottom:0%;
    right: 1%;
    width: 98%;
    height: 30px;
    background: #006231;
    z-index: 1111;
}

@media(max-width:768px) {
    .mainSlider:after,.mainSlider:before{
        height: 20px;
    }
}