.flex_center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex_row {
    display: flex;
    flex-direction: row;
    align-items: center;
}

.flex_column {
    display: flex;
    flex-direction: column;
}

.flex_rows {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

.flex_column_center {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.flex_row_center {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}