What are the advantages of using REM instead of PX?

When is it ideal to choose rem over px units in CSS? Many articles advocate for using REM to accommodate user preferences, particularly when it comes to font size. However, the focus tends to be solely on font size rather than considering other aspects like margin, padding, border, width, height, etc. For instance, an article from Stack Overflow discusses whether px or rem should be used in CSS.

While most responses emphasize the benefits of rem for font-size, why does Bootstrap still rely on px units for various styling elements such as container classes and col-* classes? Is there a specific rationale behind this choice?

In my current project where I am customizing Bootstrap styles, would it be best to replace instances of px with rems or stick with the original px units?

Appreciate any insights you can provide.

Answer №1

In order to determine which unit of CSS to use, it is essential to have a solid understanding of the different units available. Your unique vision for your website's styling will guide your decision on which unit to implement, whether it be static or dynamic/responsive. To make an informed choice, familiarize yourself with the various types of CSS units and their respective advantages. Explore the comprehensive breakdown of units like em, rem, and more at this W3Schools link:

https://www.w3schools.com/cssref/css_units.asp

Specifically discussing 'rem', it represents the font-size established for the root element, which is <html>. By default, the font-size of the <html> root element is set to 100%, equivalent to 16px as prescribed by the browser. This value can be adjusted in the browser settings or overridden within the CSS using html {font-size: 20px}. Any font-size defined for the html tag will correspond to 1rem.

While rem can be utilized for padding and margin properties, it may not be the most ideal choice due to potential issues with responsiveness. For instance, if a user alters their browser's default font-size to 25px while navigating your site, it could disrupt the design layout based on rem values. Therefore, for responsive designs, percentages (%), viewport width (vw), and viewport height (vh) units are often favored. In contrast, pixels (px) enable precise sizing without automatic adjustments.

Having determined the appropriate size for your website elements, employ the suitable CSS units accordingly to achieve the desired outcome. Remember to prioritize comprehension of the underlying principles before seeking external opinions, enhancing your coding proficiency. Happy coding!

Answer №2

Using rem units in your CSS can provide flexibility across different screen widths. Check out the benefits of using rem units at pxcoding.com/convert-px-to-rem/ and easily convert all pixel values to rem in your CSS files.

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