html, body { font-size: 16px; }

img.xl, img.lg, img.xmd, img.md, img.sm, img.xs, img.xxs { width: 100%; height: auto; }
img.xl { max-width: 1024px; }
img.lg { max-width: 512px; }
img.xmd { max-width: 384px; }
img.md { max-width: 256px; }
img.sm { max-width: 128px; }
img.xs { max-width: 64px; }
img.xxs { max-width: 32px; }

@media all and (max-width: 992px) { /* version mobile */

html, body { font-size: 12px; }

}