ALT Title of the image: CSS Units Cheat Sheet Content of the image: px - Pixel. Absolute unit, 1px = 1/96 inch. em - Relative to the font size of the parent. rem - Relative to the font size of the root element. vw - Relative to the 1% of the viewport's width. vh - Relative to the 1% of the viewport's height. % - Relative to the parent element. vmin - Relative to 1% of the viewport's smaller dimension. 1vmin = min(1vh, 1vw) vmax - Relative to 1% of the viewport's larger dimension. 1vmax = max(1vh, 1vw)