The conversion between "rem" (root em) and pixels depends on the font size defined at the root level of your HTML document.
Here's how it works:
1 rem is equal to the font size of the root element of the document. By default, this is usually 16 pixels in most web browsers, but it can be changed with CSS.
To convert 17 rem to pixels use this formula: 17 rem × font size in pixels = Pixels
base value:
Value(rem):
Value(Pixels):