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<!DOCTYPE html>
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<html>
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<style>
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body {
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height: 4000px;
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margin: 0;
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overflow: hidden;
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}
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#fixed {
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position: fixed;
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top: 50px;
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left: 50px;
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width: 100px;
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height: 100px;
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box-sizing: border-box;
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border: 1px solid blue;
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}
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</style>
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<div id="fixed"></div>
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</html>
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