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index.html:<!DOCTYPE html> <html lang="en"> <head> <meta&n...
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<!DOCTYPE html> * { margin: 0px; padding: 0px; } li { list-style:&nb...
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<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>微博...
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<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>微博...
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<!DOCTYPE html><style> #x{ width: 100px; &...
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<style>.header{width: 100%;background-color: lightgray;}.header .content{width: 1000px;height:...
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<html><head> <title>浮动</title> <style...
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