How to Create a Left-to-Right Background Color Fill on Hover Using CSS?

Achieving a Left-to-Right Background Color Fill on Hover Using CSS

To achieve a background color fill from left to right upon hovering over an element, employ a linear gradient and transition. Begin by configuring a linear gradient with two colors, for instance, red and blue, at the 50% mark. Then, set the gradient to be positioned to the right and double the size of the element, relative to its width and height (e.g., 200%).

When the element is hovered over, alter the background position to "left". Incorporate "transition: all 2s ease;" to apply a smooth transition.

For browsers that require vendor prefixes, consult the comments under the initial question.

Additional Customization

To create a color transition, increase the gradient width to 300% and adjust the start (e.g., 34%) and end (e.g., 65%) positions accordingly.

Example:

<code class="css">div {
  font: 22px Arial;
  display: inline-block;
  padding: 1em 2em;
  text-align: center;
  color: white;
  background: red; /* default color */

  /* Linear gradient and initial position */
  background: linear-gradient(to left, salmon 50%, lightblue 50%) right;
  background-size: 200%;
  transition: .5s ease-out;
}
div:hover {
  background-position: left;
}</code>

HTML:

<code class="html"><div>Hover me</div></code>

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