Blame content/assets/css/bootstrap/_thumbnails.scss

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//
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// Thumbnails
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// --------------------------------------------------
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// Mixin and adjust the regular image class
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.thumbnail {
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  @extend .img-thumbnail;
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  display: block; // Override the inline-block from `.img-thumbnail`
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  > img {
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    @include img-responsive();
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  }
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}
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// Add a hover state for linked versions only
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a.thumbnail:hover,
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a.thumbnail:focus {
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  border-color: $link-color;
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}
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// Images and captions
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.thumbnail > img {
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  margin-left: auto;
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  margin-right: auto;
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}
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.thumbnail .caption {
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  padding: $thumbnail-caption-padding;
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  color: $thumbnail-caption-color;
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}