PX batch turn REM tool in CSS

PX batch turn REM tool in CSS Introduction

1. In CSS, rem (root em) is a relative unit used to set the font size.

2. The REM value is set based on the font size of the root element (usually an html element). If you change the font size of the root element, the font size of all rem units will change accordingly.

3. REM is particularly useful for responsive web design, allowing different root font sizes to be set for different screen sizes and devices without having to change the specific font size for each element.

4. Note: rem units may in some cases be less intuitive than others (such as px or em), especially when precise control of the layout is required.