htmlize-ignore-face-size

htmlize-ignore-face-size is a variable defined in `htmlize.el'.
Its value is

absolute

Documentation:
*Whether face size should be ignored when generating HTML.
If this is nil, face sizes are used. If set to t, sizes are ignored
If set to `absolute', only absolute size specifications are ignored.
Please note that font sizes only work with CSS-based output types.

You can customize this variable.