
flex-center()
    display flex
    justify-content center
    align-items center
flex-between()
    display flex 
    justify-content space-between
    align-items center
flex-between-start()
    display flex
    justify-content space-between
    align-items flex-start
flex-col()
    display flex 
    flex-direction column
    justify-content flex-start
    align-items flex-start
flex-row()
    display flex
    justify-content flex-start
    align-items center
flex-row-start()
    display flex
    justify-content flex-start
    align-items flex-start
flex-row-wrap()
    display flex
    flex-wrap wrap
    justify-content flex-start
    align-items flex-start
box-shadow()
    box-shadow 0px 2px 10px 0px rgba(157,166,195,0.3);