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img {
object-fit: cover;
width: 100px;
height:100px;
}
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img {
display: block;
max-width: 100%;
max-height: 100%;
width: auto;
height: auto;
}
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Don't set height AND width. Use one or the other and the correct aspect ratio will be maintained.
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.image-full {
background: url(some image ) no-repeat;
background-size: cover;
background-position: center center;
}