Why is my slide-up animation using CSS3 @keyframes not working?
Oct 28, 2024 pm 08:47 PM
CSS3 Transition - Fade Out Effect
Using CSS3, you can easily implement fade-out effects to enhance the user experience. However, if you encounter issues with slide animations not working, let's explore the reasons why.
Understanding the Issue
You're attempting to create a slide-up animation using @keyframes. However, the animation is not occurring. To debug this, we'll delve into the code you provided.
<code class="css">.dummy-wrap {
animation: slideup 2s;
}</code>
This code indicates that the .dummy-wrap class should perform the slideup animation for 2 seconds. The @keyframes block defines the animation's movements:
<code class="css">@keyframes slideup {
0% {top: 0px;}
75% {top: 0px;}
100% {top: -20px;}
}</code>
Troubleshooting the Slide Animation
Inspecting the keyframes, we notice that the element's position only changes in the last 25% of the animation. Since the element starts at top: 0px; and ends at top: -20px;, it will essentially move instantly to top: -20px;, resulting in a sudden "slide-up" effect.
Alternative Solution for Fade-Out
Instead of using translate, you can use opacity to achieve a fade-out effect. Here's how you can implement it:
<code class="css">.hidden {
opacity: 0;
transition: opacity 2s;
}</code>
This technique gradually reduces the element's opacity, creating a visible fade-out effect over the course of 2 seconds.
Additional Details
In the initial version of your code, the sudden "slide-up" effect was due to the fact that the element's position was only modified in the last 25% of the animation. By switching to opacity and transitioning it over the entire duration, we achieve a smooth fade-out effect.
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