.u-block{
    display: block;
}
.u-inline{
    display: inline;
}
.u-inlineblock{
    display: inline-block;
}
.u-inlineflex{
    display: inline-flex;
}
.u-flex{
    display: flex;
}

.u-fw{
    width: 100%;
}
.u-flex-grow{
    flex-grow: 1;
}
.u-flex-shrink{
    flex-shrink: 1;
}
.u-flex-center--v{
    align-items: center;
}
.u-flex-center--h{
    justify-content: center;
}
.u-flex-space--b{
    justify-content: space-between
}
.u-flex-space--a{
    justify-content: space-around;
}
.u-flex-space--e{
    justify-content: space-evenly;
}