.flex-r {
    display: flex;
    flex-direction: row;
}
.flex-r-c {
    display: flex;
    flex-direction: row;
    align-items: center;
}
.flex-r-c-c {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}
.flex-r-c-c-w {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.flex-c {
    display: flex;
    flex-direction: column;
}
.flex-c-c {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.flex-c-c-c {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.flex-c-c-c-w {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.flex-w {
    display: flex;
    flex-wrap: wrap;
}

@media (min-width: 640px) {
    .sm\:flex-c {
        display: flex;
        flex-direction: column;
    }
    .sm\:flex-r {
        display: flex;
        flex-direction: row;
    }
}