A small genbox function that reproduces in Typst the LaTeX tcolorbox “flag” (drapeau) style: a title attached to the top left, with a horizontal 3-stop gradient ribbon and its dark drop shadow.
100 % Typst, no dependencies (no cetz required);
works with Typst >= 0.13 (uses the curve element);
breakable box across pages;
fully customizable colors (colback, colframe, colribbon, colribbon-milieu, coltitre);
fine tuning of the flag (xshift, overlap, rayon, debord, inset).
flagbox.typ (2.9 KB)