title: When working on a responsive web, can I use % or vw units for font size?
body: <p>Do I have to use the font size in em or rem units? Can't I use the %vw units?</p>
  <p>The width of the speech bubble is % unit, so if the browser size decreases, the font size is fixed, it cannot match the speech bubble. So, I'm going to use vw unit of the font-size. Is this the recommended usage? Or should we avoid doing this if possible? Should I use em or rem units?</p>
  <p>I used the % unit, so even if it's 100%, the letters are too small. If I use the vw unit, the font size comes out exactly, but if I use the vw unit, will there be a problem if the horizontal resolution is over 1920 and bigger? The max-width value of the body tag is 1920px on the site I make.</p>