x
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<style>
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.container {
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display: box;
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display: flexbox;
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display: flex;
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height: 200px;
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line-height: 200px;
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text-align: center;
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}
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.left,
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.right {
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box-flex: 0;
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flex: 0 0 100px;
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flex: 0 0 100px;
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background: green;
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}
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.main {
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box-flex: 1;
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flex: 1 1 auto;
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flex: 1 1 auto;
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background: black;
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color: white;
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}
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</style>
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<div class="container">
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<div class="left">左边固定宽度</div>
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<div class="main">中间自适应</div>
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<div class="right">右边固定宽度</div>
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</div>
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