:first-child
一番最初のヤツに
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li:first-child{background:#e1f5a9;;}
:last-child
一番最後のヤツに
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li:last-child{background:#e1f5a9;;}
:nth-child(n)
n番目のヤツに
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li:nth-child(2){background:#e1f5a9;}
:nth-child(odd)
奇数番目のヤツに
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li:nth-child(odd){background:#e1f5a9;}
:nth-child(even)
偶数番目のヤツに
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li:nth-child(even){background:#e1f5a9;}