fronend/scss/_datetimepicker.scss

.dtp {
    div.dtp-date,
    div.dtp-time {
        background: #007d72;
    }

    > .dtp-content {
        > .dtp-date-view {
            > header.dtp-header {
                background: #009688;
            }
        }
    }

    .dtp-buttons {
        .dtp-btn-ok {
            margin-left: 10px;
        }

        .dtp-btn-clear {
            margin-right: 10px !important;
        }
    }

    .p10 {
        > a {
            color: #fff;
        }
    }

    div.dtp-actual-year {
        font-size: 1.5em;
        color: #ffffff;
    }

    table.dtp-picker-days {
        tr {
            td {
                a.selected {
                    background: #007d72;
                    color: #fff;
                }
            }
        }
    }
}