.ou-swatches{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:10px;
  align-items:center;
}

.ou-swatch{
  width:22px;
  height:22px;
  border-radius:6px;
  border:1px solid rgba(0,0,0,.18);
  box-shadow: 0 2px 6px rgba(0,0,0,.08);
  cursor:pointer;
  padding:0;
  outline:none;
  position:relative;
  background:transparent;
}

.ou-swatch:hover{
  transform: translateY(-1px);
}

.ou-swatch.is-active{
  border-color: rgba(0,0,0,.55);
}

.ou-swatch.is-active::after{
  content:"";
  position:absolute;
  inset:-4px;
  border:2px solid rgba(0,0,0,.35);
  border-radius:10px;
}

.ou-swatch--empty{
  background: repeating-linear-gradient(
    45deg,
    #ddd,
    #ddd 5px,
    #f7f7f7 5px,
    #f7f7f7 10px
  );
}
.ou-swatches{
  margin-left: 12px; /* separa del selector */
  margin-top: 0;     /* como están en línea, no hace falta */
}