CSS Font Size Is Relative To The Container - The Easiest Way
rem vs em: Understanding the CSS Unit Basics
CSS : How to make font-size relative to parent div? - YouTube
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Here's a cheat sheet for CSS units : r/webdev
css - formular to calculate width/height (relative to parent) of container with translateZ inside of parent container with perspective - Stack Overflow
Font-size responsive (relative to the parent) - HTML-CSS - The freeCodeCamp Forum
Font Size Guidelines for Responsive Websites
Understanding relative CSS units – Sebastian Weber – Frontend developer who likes to learn by teaching