@media (max-width: 991.98px) {

    .dates_calendar_block .col {
        height: 130px;
    }
}

@media (max-width: 767.98px) {
    #dates {
        margin-bottom: 50px;
    }
}

@media (max-width: 650px) {

    #dates .dates_calendar_block .col.no_month,
    #dates .dates_calendar_block .col.day {
        display: none;
    }

    .dates_calendar_block .dweek {
        display: block;
    }

    #dates .dates_calendar_block .col {
        width: 33.3%;
        max-width: 33.3%;
    }

    #dates .dates_calendar_block .col:nth-last-child(-n+7) {
        border-bottom: 0; 
    }

    #dates .dates_calendar_block .col:nth-last-child(-n+3) {
        border-bottom: 1px solid black; 
    }

    #dates .dates_calendar_block .col:nth-child(7n+1) {
        border-left: 0;
    }

    #dates .dates_calendar_block .col:nth-child(3n+1) {
        border-left: 1px solid black;
    }

}