.left-border {
    border-left:1px solid #ddd;
}

.right-border {
    border-right:1px solid #ddd;
}

.top-border {
    border-top:1px solid #ddd;
}

.bottom-border {
    border-bottom:1px solid #ddd;
}

@media screen and (max-width: 980px) {
    .left-border {
    border-left:0px solid #ddd;
}

    .right-border {
    border-right:0px solid #ddd;
}

.top-border {
    border-top:0px solid #ddd;
}

.bottom-border {
    border-bottom:0px solid #ddd;
}

}