the_border css px base_color css color fff css id header color base_co

the_border = css.px(1)
base_color = css.color(fff)

css.id('header',
    color = base_color * 3,
    border-left = the_border,
    border-right = the_border * 3,
)

css.class('footer',
    color = (base_color + css.color(111)) *1.5
)

"""
Result:

#header {
    color: #2fffffd;
    border-left: 1;
    border-right: 3;
}

.footer {
    color: #1999998;
}
"""