open-vault/ui/app/styles/components/hover-copy-button.scss

.has-copy-button {
  position: relative;
  color: $grey;
}
.hover-copy-button,
.hover-copy-button-static {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
}

.hover-copy-button {
  opacity: 0;
  pointer-events: none;
  transition: opacity $speed ease-in-out;
  will-change: opacity;
  z-index: 10;
}

.has-copy-button:hover .hover-copy-button,
.has-copy-button:focus .hover-copy-button,
.hover-copy-button .copy-button:focus {
  opacity: 1;
  pointer-events: auto;
}