.flex-container-center {
    justify-content: center;
}
.flex-column-container {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;
}
.flex-row-container {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
}
.flex-row-container-wrap {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}
.flex-item-fixed {
    display: block;
    flex-grow: 0;
    flex-shrink: 0;
}
.flex-item-expand {
    display: block;
    flex-grow: 1;
    flex-shrink: 0;
}
.flex-item-shrink {
    display: block;
    flex-grow: 0;
    flex-shrink: 1;
}