48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
---
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title: Hover underline animation
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tags: animation,advanced
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---
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Creates an animated underline effect when the text is hovered over.
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- `display: inline-block` makes the block `p` an `inline-block` to prevent the underline from spanning the entire parent width rather than just the content (text).
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- `position: relative` on the element establishes a Cartesian positioning context for pseudo-elements.
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- `:after` defines a pseudo-element.
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- `position: absolute` takes the pseudo element out of the flow of the document and positions it in relation to the parent.
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- `width: 100%` ensures the pseudo-element spans the entire width of the text block.
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- `transform: scaleX(0)` initially scales the pseudo element to 0 so it has no width and is not visible.
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- `bottom: 0` and `left: 0` position it to the bottom left of the block.
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- `transition: transform 0.25s ease-out` means changes to `transform` will be transitioned over 0.25 seconds with an `ease-out` timing function.
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- `transform-origin: bottom right` means the transform anchor point is positioned at the bottom right of the block.
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- `:hover:after` then uses `scaleX(1)` to transition the width to 100%, then changes the `transform-origin` to `bottom left` so that the anchor point is reversed, allowing it transition out in the other direction when hovered off.
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```html
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<p class="hover-underline-animation">Hover this text to see the effect!</p>
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```
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```css
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.hover-underline-animation {
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display: inline-block;
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position: relative;
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color: #0087ca;
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}
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.hover-underline-animation:after {
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content: '';
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position: absolute;
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width: 100%;
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transform: scaleX(0);
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height: 2px;
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bottom: 0;
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left: 0;
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background-color: #0087ca;
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transform-origin: bottom right;
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transition: transform 0.25s ease-out;
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}
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.hover-underline-animation:hover:after {
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transform: scaleX(1);
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transform-origin: bottom left;
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}
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```
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