Why is my slide-up animation using CSS3 @keyframes not working?

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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