1fr 2fr / 1fr 2fr 3fr 1fr
3fr 2fr / 1fr 2fr 2fr 3fr
[top] "hd hd" 10px [middle] "nv mn" 30px [bottom]
2px
5px 10px
2px 2%
5px
2px 1rem
calc(2px + 1%)
grid: 1fr 2fr / 1fr 2fr 3fr 1fr
gap: 2px
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