PNG transparency

[RhymesOfContraband]

Hi,

I'm a novice so I might very well be missing the obvious.
When I insert a picture with a pop-up window for full-size (in markdown) or when I use a gallery, the images displayed in the post have a correct transparent background, but the full-view insert a coloured background, getting rid of the transparency.

Thanks for your time.

Comparison between green website background and grey pop-up background:

[RhymesOfContraband]

Solved it now that I understand how things work a little better.

The box shadows parameter in _sass\minimal-mistakes\vendor\magnific-popup_magnific-popup•scss

  .mfp-figure {
    line-height: 0;
    &:after {
      content: '';
      position: absolute;
      left: 0;
      top: $mfp-image-padding-top;
      bottom: $mfp-image-padding-bottom;
      display: block;
      right: 0;
      width: auto;
      height: auto;
      z-index: -1;
      box-shadow: transparent;
      background: $mfp-image-background;