Answers for "font size responsiveness"

responsive font-size

/* please refer to https://developer.mozilla.org/fr/docs/Web/CSS/clamp() */
font-size: clamp(40px, 10vw, 70px); /* clamp(MIN, VAL, MAX) */

how to make fonts respnsive

h1 {
  font-size: clamp(16px, 5vw, 34px);
}

responsive text css

<h1 style="font-size:10vw;">Responsive Text</h1>

<p style="font-size:5vw;">Resize the browser window to see how the text size scales.</p>