https://youtu.be/2mIQTxRyn-0 아래는 freecodecamp에서 CSS 속성값에 대한 설명에 나오는 em과 rem The two main types of length units are absolute and relative. Absolute units tie to physical units of length. For example, in and mm refer to inches and millimeters, respectively. Absolute length units approximate the actual measurement on a screen, but there are some differences depending on a screen's resolution. Relat..