ul.fw-swatches{
  padding: 0;
}

ul.fw-swatches li.fw-swatch {
  list-style: none;
  width: 70px;
  display: inline-block;
  border: transparent 1px solid;
  margin-bottom: 5px;
  margin-right: 5px;
  position: relative;
}

ul.fw-swatches li.fw-swatch img {
  max-width: 100%;
  height: auto;
}

ul.fw-swatches li.fw-swatch.sold-out {
  border-color: lightgrey;
}

ul.fw-swatches li.fw-swatch.current{
  border-color: black;
}

ul.fw-swatches li.fw-swatch.sold-out img {
  opacity: .5;
}

ul.fw-swatches li.fw-swatch .overlay {
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' viewBox='0 0 10 10' preserveAspectRatio='none'><line x1='10' y1='0' x2='0' y2='10' stroke='lightgrey' stroke-width='.1' /></svg>");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: 100% 100%, auto;
  display: none;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

ul.fw-swatches li.fw-swatch.sold-out .overlay {
  display: block;
}