.o_wevent_participating_container {
    position: relative;

    &::before {
        content: "";
        @include o-position-absolute(0, auto, 0, 0);
        width: 3px;
        background-color: theme-color('info');
    }
}
.o_wevent_registration_list_attendees:nth-child(2n) {
    background-color: gray('200');
}