各种css垂直居中解决方案
(不定，定) absolute + 负margin
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(不定，定) absolute + auto-margin
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(不定，定) absolute + calc
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(定，不定) line-height + vertical-align
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(不定，不定 ) absolute + transform
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(不定，不定) css-table
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(不定，不定) flex
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