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File: _image.scss
// Responsive image // // Keep images from scaling beyond the width of their parents. @mixin img-responsive($display: block) { display: $display; max-width: 100%; // Part 1: Set a maximum relative to the parent height: auto; // Part 2: Scale the height according to the width, otherwise you get stretching } // Retina image // // Short retina mixin for setting background-image and -size. Note that the // spelling of `min--moz-device-pixel-ratio` is intentional. @mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) { background-image: url(if($bootstrap-sass-asset-helper, twbs-image-path("#{$file-1x}"), "#{$file-1x}")); @media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and ( min--moz-device-pixel-ratio: 2), only screen and ( -o-min-device-pixel-ratio: 2/1), only screen and ( min-device-pixel-ratio: 2), only screen and ( min-resolution: 192dpi), only screen and ( min-resolution: 2dppx) { background-image: url(if($bootstrap-sass-asset-helper, twbs-image-path("#{$file-2x}"), "#{$file-2x}")); background-size: $width-1x $height-1x; } }