Double box/border? Is this possible in CSS?

Question

I\'m trying to recreate this image in CSS.

This is what I got from experimenting, so far. I used box-shadow to act as the second box. I\'m not sure if there\'s a bet

Answer 1

The concept behind using box-shadow is that two shadows, one white and one black, overlap to simulate a second black border. But the black shadow is only visible in the direction from which it is offset from the white shadow, so a gap is apparent between the original border and the black shadow (as shown in the OP's original post).

The "spread radius" of the black shadow could utilized to eliminate this gap (cleverly demonstrated by Nirav Joshi), but then the curvature of the corners is amplified and the two borders look different.

To duplicate the original border, I'd use ::after to generate an absolutely-positioned pseudo-element and use z-index to place it behind the original element. To further ensure that the border is duplicated exactly, I like Vadim Ovchinnikov's idea of inheriting the border color and radius from the original element.

.border {
  position: relative;
  text-align: center;
  border: solid 3px black;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 600;
  color: black;
  letter-spacing: 2px;
  padding: 20px 15px;
  margin: 15px 15px;
  background: white;
}

.border::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  top: 3px;
  left: 3px;
  border: solid 3px black;
  border-radius: 5px;
  z-index: -1;
}

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