CSS Units - W3Schools
Try it Yourself » Note: A whitespace cannot appear between the number and the unit. However, if the value is 0, the unit can be omitted. For some CSS properties, negative lengths are …
rem () - CSS | MDN
Nov 6, 2025 · The rem() CSS function returns a remainder left over when the first parameter is divided by the second parameter, similar to the JavaScript remainder operator (%).
Rem in CSS: Understanding and Using rem Units - SitePoint
Dec 11, 2019 · In CSS rem stands for “root em”, a unit of measurement that represents the font size of the root element. This means that 1rem equals the font size of the html element, which …
CSS Units – When to Use rem, em, px, and More
Jan 25, 2024 · By using rem units, you can easily scale the font size of the body elements proportionally to the HTML font size. It's a good idea to use rem to set font sizes because it is …
What are Rem Units in CSS? - GeeksforGeeks
Oct 9, 2024 · Rem units are relative units of measurement in CSS that are based on the font size of the root element (<html>). If the root font size is set to 16px, then 1rem is equivalent to 16px.
CSS rem Units: Complete Guide to Root Element Font-Size …
Jun 16, 2025 · What are CSS rem Units? The rem unit stands for “root em” and represents a relative length unit in CSS. It’s calculated based on the font-size of the root element (html …
What Is Rem In CSS? - Elementor
Nov 30, 2025 · Creating websites that look stunning across different devices and screen sizes is essential. That’s where REM units in CSS come to the rescue! Think of REM (short for “ root …
CSS values and units - Learn web development | MDN
Dec 19, 2025 · To recap, the rem unit means "The root element's font-size" (rem stands for "root em"). The <li> elements inside the <ul> with a class of rems take their sizing from the root …
CSS rem () function - W3Schools
The CSS rem() function returns the remainder left over when a number (dividend) is divided by another number (divisor). Example: rem (9, 2) = 1. (9 / 2 = 4; 4*2 = 8, remainder =1)
How do Rem & Em work in CSS? And how to use them?
Feb 25, 2025 · For global layouts and typography, use rem to maintain a consistent scale. Use em for elements that need to adapt to parent-specific styles, like buttons, menus, or cards.