src/scss/photoswipe/_main-settings.scss

   1 $pswp__show-hide-transition-duration: 333ms !default;
   2 $pswp__controls-transition-duration: 333ms !default;
   3 $pswp__background-color: #000 !default;
   4 $pswp__placeholder-color: #222 !default;
   5 $pswp__box-sizing-border-box: true !default; // disable .pswp * { box-sizing:border-box } (in case you already have it in your site css)
   6 $pswp__root-z-index: 1500 !default;
   7 $pswp__assets-path: '' !default; // path to skin assets folder (preloader, PNG and SVG sprite)
   8 $pswp__error-text-color: #CCC !default; // "Image not loaded" text color
   9 $pswp__include-minimal-style: true !default;