Grid practice tests:

200px
75px
50px
1fr
75px
col 1
col 2
col 3
col 4
col 1
col 2
col 3
col 4

FlexBox

200px
75px
item1
item2
item3
item1
item2
item3
item4
item1
item2

FlexBox Challenge exercises

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Nested FlexBox exercises

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Challenging exercises

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