A.flex-start
B.flex-end
C.space-between
D.space-around

A.flex-direction：row
B.flex-direction：row-reverse
C.flex-direction：column
D.flex-direction：column-reverse

A.none
B.border-box
C.content-box
D.padding-box

A.box-shadow：7px-4px10px#000inset
B.box-shadow：-7px4px10px#000
C.box-shadow：7px4px10px#000inset
D.box-shadow：7px-4px10px#000

A.border-image-source
B.border-image-slice
C.border-image-repeat
D.border-image-outset

A.border-top-left-radius
B.border-left-top-radius
C.top-left-border-radius
D.left-top-border-radius

A.cover
B.length
C.percentage
D.contain

A.percentage
B.cover
C.contain
D.length

A.scroll
B.fixed
C.strech
D.relative