CSS double border (2 colors) without using outline?

Question

I was wondering what you guys think is the easiest way to get a double border with 2 colors around a div? I tried using border and outline together and it worked in Firefox

Answer 1

Late to the party for this question, but I feel like I should record this somewhere. You can make a scalable function in something like Less or Stylus which will create any number of borders (Stylus here):

abs(n)
    if n < 0
        (-1*n)
    else
        n

horizBorder(n, backgroundColor)
    $shadow = 0 0 0 0 transparent
    $sign = (n/abs(n))
    for $i in ($sign..n)
        /* offset-x | offset-y | blur-radius | spread-radius | color */
        $shadow = $shadow, 0 (2*$i - $sign)px 0 0 #000, 0 (2*$i)px 0 0 backgroundColor
    return $shadow

Then,

$background: #FFF // my background was white in this case and I wanted alternating black/white borders

.border-bottom
    box-shadow: horizBorder(5, $background)
.border-top
    box-shadow: horizBorder(-5, $background)
.border-top-and-bottom
    box-shadow: horizBorder(5, $background), horizBorder(-5, $background)