html {
    /* How to pick these parameters
     *
     * First, decide on a maximum and minimum font size.
     *
     * The choose the middle value so that the maximum font size will
     * be used until the screen is too small:
     * `100lvi / body-inline-size`
     */
    font-size: clamp(0.9em, 2.5lvi, 1.2em);
}