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Try:
.img {
height: 100%;
max-width: 100%
}
Alternatively you can use SVG:
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" height="100%" preserveAspectRatio="xMidYMid meet" version="1.1" viewBox="0 0 [original width] [original height]" width="100%">
<image height="[original height]" width="[original width]" xlink:href="[imagefile]"></image>
</svg>
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