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  width: 1024px;
}
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<p>"fastestest" way: added this in inspector:</p>
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  outline: 1px solid #f00 !important;
}
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<p>and the culprit appeared</p>
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<p>refer to :</p>
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<p><a href="https://stackoverflow.com/questions/31458477/find-element-that-is-causing-the-showing-of-horizontal-scrollbar-in-google-chrom?answertab=votes#tab-top">https://stackoverflow.com/questions/31458477/find-element-that-is-causing-the-showing-of-horizontal-scrollbar-in-google-chrom?answertab=votes#tab-top</a></p>
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