// 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;
    }
  }