The Windows 95/98 desktop GUI reproduced faithfully on the web: #c0c0c0 silver chrome, 3D bevels built from stacked inset box-shadows instead of borders, navy title bars with a gradient to dialog blue, bitmap-flavored type, and zero animation. Every control looks pressable because light literally falls on it from the top-left.
Primary actionThe four-shadow bevel: raised chrome drawn as inset -1px -1px #0a0a0a, inset 1px 1px #ffffff, inset -2px -2px #808080, inset 2px 2px #dfdfdf — inverted to sunken on press, exactly as published in 98.css.