Explain the preferred way of font sizing.

In CSS, defining the font size is very important for making the content as per the requirements. The size of the text mainly focused on the units you have used. The units can be px, em, rem, %, vs, and vh. Mainly pixel (px) is used for defining the font sizes, as we know that all browsers do not support the same fonts. Systems primarily install web-safe fonts, and browsers occasionally fail to recognize them. A fallback font displays the content in a browser to address this issue.