/* mdbook clamps the main content column to ~750px by default. Cap by
 * characters instead so the column scales with the chosen font: 100ch
 * matches the conventional 100-column code-line standard, which is more
 * than wide enough for prose while preventing overly long lines on big
 * displays. The `ch` unit is the width of the "0" glyph in the
 * inherited font. */
:root {
    --content-max-width: 100ch;
}
.content main {
    max-width: 100ch;
}