/* Notebook figures are already opaque/white-backgrounded PNGs, so the theme's dark-mode
   treatment of cell outputs (background + padding) is unneeded -- and combined with the
   fixed width/height attributes myst-nb puts on each <img> plus global box-sizing:
   border-box, that padding squishes the images out of their native aspect ratio. */
html[data-theme="dark"] .bd-content div.cell_output img {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
}