CSS gradient colors can't be animated. This demo shows a workaround. Hover to see it in action. Implementation on left, visual explanation on right.
Blog post: Gradient Animation Trick
Forked from anonymous/Gradient-Animation-Trick.markdown
Created
February 15, 2014 16:18
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| <div class="container"> | |
| <button disabled>Some Button</button> | |
| <div class="slider"></div> | |
| <div class="frame"></div> | |
| </div> | |
| <div class="info"> | |
| You can't animate gradient colors with pure CSS. Gradients are set via background-image, which is not (currently) an animatable property. But background-position is. So you can use background-size to make the background taller than the element it's on, then animate background-position to slide it up or down. The result is a simple animated fading gradient. | |
| </div> |
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| body { | |
| margin: 20px; | |
| background-color: #000; | |
| } | |
| .container { | |
| position: relative; | |
| margin: 0 auto; | |
| width: 480px; | |
| height: 140px; | |
| background-color: #333; | |
| border-radius: 8px; | |
| } | |
| button { | |
| position: absolute; | |
| width: 160px; | |
| height: 36px; | |
| top: calc(50% - 18px); | |
| left: 50px; | |
| border: solid 1px #ccc; | |
| border-radius: 8px; | |
| color: #fff; | |
| font: 16px sans-serif; | |
| /* set up background gradient and animation */ | |
| background-image: linear-gradient(#5187c4, #1c2f45); | |
| background-size: auto 200%; | |
| background-position: 0 100%; | |
| transition: background-position 0.5s; | |
| } | |
| .container:hover button { | |
| /* shift background gradient position */ | |
| background-position: 0 0; | |
| } | |
| .slider { | |
| position: absolute; | |
| top: calc(50% - 18px); | |
| right: 50px; | |
| margin-top: -36px; | |
| width: 160px; | |
| height: 72px; | |
| background-image: linear-gradient(#5187c4, #1c2f45); | |
| transition: margin-top .5s; | |
| } | |
| .container:hover .slider { | |
| margin-top: 0px; | |
| } | |
| .frame { | |
| position: absolute; | |
| top: calc(50% - 18px); | |
| right: 50px; | |
| box-sizing: border-box; | |
| width: 160px; | |
| height: 36px; | |
| border: solid 1px #ccc; | |
| border-radius: 8px; | |
| } | |
| .info { | |
| margin: 20px auto 0; | |
| color: #ccc; | |
| font: 18px/150% sans-serif; | |
| text-align: justify; | |
| width: 480px; | |
| } |
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