.main_ytthumb {
    border: 1px solid #000;
    padding: 5px;
    width: 250px;
}

@media screen and (max-width: 550px) {
    .main_ytthumb {
        width: 95%;
    }
}

.work_divider {
    margin: 20px 0;
    text-align: center;
}

/* groups and stacks */

.group {
    display: flex;
    gap: 15px;
}

@media screen and (max-width: 550px) {
    .group.group___thumb {
        flex-direction: column;
        margin-bottom: 15px;
    }
}

.group.group___v {
    flex-direction: column;
    gap: 15px;
}