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diff --git a/vendor/twbs/bootstrap/scss/mixins/_image.scss b/vendor/twbs/bootstrap/scss/mixins/_image.scss
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+// Image Mixins
+// - Responsive image
+// - Retina image
+
+
+// Responsive image
+//
+// Keep images from scaling beyond the width of their parents.
+
+@mixin img-fluid {
+ // Part 1: Set a maximum relative to the parent
+ max-width: 100%;
+ // Part 2: Override the height to auto, otherwise images will be stretched
+ // when setting a width and height attribute on the img element.
+ height: auto;
+}
+
+
+// Retina image
+//
+// Short retina mixin for setting background-image and -size.
+
+// stylelint-disable indentation, media-query-list-comma-newline-after
+@mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {
+ background-image: url($file-1x);
+
+ // Autoprefixer takes care of adding -webkit-min-device-pixel-ratio and -o-min-device-pixel-ratio,
+ // but doesn't convert dppx=>dpi.
+ // There's no such thing as unprefixed min-device-pixel-ratio since it's nonstandard.
+ // Compatibility info: https://caniuse.com/#feat=css-media-resolution
+ @media only screen and (min-resolution: 192dpi), // IE9-11 don't support dppx
+ only screen and (min-resolution: 2dppx) { // Standardized
+ background-image: url($file-2x);
+ background-size: $width-1x $height-1x;
+ }
+}