Stirling-PDF/src/main/resources/static/css/pdfActions.css

.pdf-actions_button-container {
  z-index: 2;
  display: flex;
  opacity: 0;
  transition: opacity 0.1s linear;
}

.pdf-actions_container:hover .pdf-actions_button-container {
  opacity: 1;
}

.pdf-actions_button-container > * {
  padding: 0.25rem 0.5rem;
  margin: 3px;
  display: block;
}

.pdf-actions_container svg {
  width: 16px;
  height: 16px;
}
.pdf-actions_container:nth-child(1) .pdf-actions_move-left-button {
  display: none;
}
.pdf-actions_container:last-child .pdf-actions_move-right-button {
  display: none;
}

/* "insert pdf" buttons that appear on the right when hover */
.pdf-actions_insert-file-button-container {
  translate: 0 -50%;
  width: 80px;
  height: 100%;

  z-index: 1;
  opacity: 0;
  transition: opacity 0.2s;
}

.pdf-actions_insert-file-button-container.left {
  left: -20px;
}

.pdf-actions_insert-file-button-container.right {
  right: -20px;
}

html[dir="ltr"] .pdf-actions_insert-file-button-container.right {
  display: none;
}

html[dir="rtl"] .pdf-actions_insert-file-button-container.left {
  display: none;
}

.pdf-actions_insert-file-button-container.left .pdf-actions_insert-file-button {
  left: 0;
  translate: 0 -50%;
}

.pdf-actions_insert-file-button-container.right .pdf-actions_insert-file-button {
  right: 0;
  translate: 0 -50%;
}

html[dir="ltr"] .pdf-actions_container:last-child > .pdf-actions_insert-file-button-container.right {
  display: block;
}

html[dir="rtl"] .pdf-actions_container:last-child > .pdf-actions_insert-file-button-container.left {
  display: block;
}

.pdf-actions_insert-file-button-container:hover {
  opacity: 1;
  transition: opacity 0.05s;
}
.pdf-actions_insert-file-button {
  position: absolute;
  top: 50%;
  right: 50%;
  translate: 50% -50%;
  aspect-ratio: 1;
  border-radius: 100px;
}