// Image Mixins
 // - Responsive image
 // - Retina image
 
 
 // Responsive image
 //
 // Keep images from scaling beyond the width of their parents.
 .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.
 .img-retina(@file-1x; @file-2x; @width-1x; @height-1x) {
   background-image: url("@{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("@{file-2x}");
     background-size: @width-1x @height-1x;
   }
 }