.add
    &-sticky
        position: sticky
        top: $margin
    &-float-right
        float: right
    &-float-left
        float: left
    &-flex
        display: flex
    &-justify
        &-center
            justify-content: center
        &-end
            justify-content: flex-end
        &-start
            justify-content: flex-start
        &-around
            justify-content: space-around
        &-between
            justify-content: space-between
    &-align
        &-center
            align-items: center
        &-end
            align-items: flex-end
        &-start
            align-items: flex-start
        &-baseline
            align-items: baseline
        &-stretch
            align-items: stretch