If the max-width property is set to 100%, the image will scale down if it has to, but never scale up to be larger than its original size:
img { max-width: 100%; height: auto;}
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If the max-width property is set to 100%, the image will scale down if it has to, but never scale up to be larger than its original size:
img { max-width: 100%; height: auto;}
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转载于:https://www.cnblogs.com/time-is-life/p/7279321.html