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<!DOCTYPE html>
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<html style="margin: 0">
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<body style="margin: 0">
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<div style="height: 70px; background-color: blue"></div>
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<div style="height: 2000px;">
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<div style="margin-top: 50px; width: 100px; height: 100px; background-color: green"></div>
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</div>
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</html>
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