What is the difference between PX and REM?

PX (pixels) are fixed units that don't scale with user preferences. REM (root em) units are relative to the root font size (usually 16px), making them accessible and responsive. Using REM allows users to adjust text size in their browser settings.

How do I convert pixels to REM?

Divide the pixel value by the root font size (default 16px). Formula: rem = px / 16. For example, 24px = 24/16 = 1.5rem. Common conversions: 12px = 0.75rem, 14px = 0.875rem, 16px = 1rem, 18px = 1.125rem.

What is the default browser font size?

The default root font size in most browsers is 16 pixels. This means 1rem = 16px by default. However, users can change this in their browser settings for accessibility, which is why using REM units is recommended.

When should I use REM vs EM?

Use REM for consistent sizing relative to the root (html) element - ideal for spacing, font sizes, and layout. Use EM for sizing relative to the parent element - useful for component-specific scaling like padding within buttons.

What are viewport units (vw, vh)?

Viewport units are relative to the browser window size. 1vw = 1% of viewport width, 1vh = 1% of viewport height. They're useful for full-screen sections and responsive typography, but can cause issues on mobile due to dynamic viewport changes.

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