.cover {
    background-size: cover;
    background-position: center;
    height: 580px;
    box-shadow: 0px 5px 10px 0px rgba(0,0,0,0.4);
}

#cover_about {
    background-image: url("../img/DSC_5258.jpg");
}

#cover_products {
    background-image: url("../img/DSC_5294.jpg");
    background-position-y: 42%;
}

#cover_services {
    background-image: url("../img/DSC_5237.jpg");
}

#cover_contact {
    background-image: url("../img/DSC_5283.jpg");
    background-position-y: 32%;
}

@media (max-width: 1000px) {
    .cover {
        height: 300px;
    }
    #cover_about {
        background-image: url('../img/sm/DSC_5258.jpg');
    }

    #cover_products {
        background-image: url('../img/sm/DSC_5294.jpg');
    }

    #cover_services {
        background-image: url('../img/sm/DSC_5237.jpg');
    }

    #cover_contact {
        background-image: url('../img/sm/DSC_5283.jpg');
    }
}

@media (min-width: 1001px) and (max-width: 2000px) {
    #cover_about {
        background-image: url('../img/md/DSC_5258.jpg');
    }

    #cover_products {
        background-image: url('../img/md/DSC_5294.jpg');
    }

    #cover_services {
        background-image: url('../img/md/DSC_5237.jpg');
    }

    #cover_contact {
        background-image: url('../img/md/DSC_5283.jpg');
    }
}

@media  (min-width: 2001px) and (max-width: 4000px)  {
    #cover_about {
        background-image: url('../img/lg/DSC_5258.jpg');
    }

    #cover_products {
        background-image: url('../img/lg/DSC_5294.jpg');
    }

    #cover_services {
        background-image: url('../img/lg/DSC_5237.jpg');
    }

    #cover_contact {
        background-image: url('../img/lg/DSC_5283.jpg');
    }
}