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

.flex-horizontal {
    display: flex;
}

.flex-item-grow-1 {
    flex-grow: 1;
}

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

.square-div {
    position: relative;
}

.square-div:before {
    content: "";
    display: block;
    padding-top: 100%;
}

.flex-space-even {
    flex-wrap: nowrap;
    justify-content: space-evenly;
}

.flex-centering { 
    display: flex;
    justify-content: center;
}