What is the best way to modify this CSS code to achieve the opposite effect?

I have a CSS animation code that animates an object as it appears from top to bottom (when scrolling). Here is the current code:

 .animate-in-down {
  transition: all 1.3s ease-out;
    position:relative;
  opacity:1;
  top:0px;
  &.out-of-viewport {
    top:40px;
    opacity:0;
  }
}

Now, I would like to modify this code so that the object comes from top to bottom instead of the current bottom to top animation. Can someone please assist me with this?

Answer №1

Here is a straightforward method to achieve what you're trying to do.

Key takeaways:

  • Avoid explicitly declaring the initial transition states in your CSS, such as opacity: 1. It is unnecessary and adds redundancy.
  • Instead of using top for transitions/animations, opt for transform for better performance, especially on less powerful mobile devices (More Information).

document.querySelector('button').addEventListener('click', () => {
  document.querySelector('.box').classList.toggle('hide');
});
.box {
  height: 100px;
  width: 100px;
  background-color: red;
  transition-duration: .5s;
  transition-property: opacity, transform;
  transition-timing-function: ease-in-out;
}

.box.hide {
  opacity: 0;
  transform: translateY(-300px);
}
<div class="box"></div>
<button>Toggle</button>

https://jsfiddle.net/wrds8gf5/

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