Sibling fade

Fades out the siblings of a hovered item.

• Use a transition to animate changes to opacity.
• Use the :hover and :not pseudo-class selectors to change the opacity of all elements except for the one the mouse is over to 0.5.

<div class="sibling-fade">
  <span>Item 1</span> <span>Item 2</span> <span>Item 3</span>
  <span>Item 4</span> <span>Item 5</span> <span>Item 6</span>
</div>

span {
  padding: 0 16px;
  transition: opacity 0.3s;
}

.sibling-fade:hover span:not(:hover) {
  opacity: 0.5;
}