Fading Animation

I dont understand why in the lesson about animation movement, it starts at 0% using pixels but the lesson after which teaches about fading animation starts off at 50% and uses % instead of pixels. I was just messing around with the code and change it to pixels but when using the offset of left, the animation moved right. Only difference I noticed in was that the element was positioned absolute instead of relative

#ball { width: 70px; height: 70px; margin: 50px auto; position: fixed; left: 20%; border-radius: 50%; background: linear-gradient( 35deg, #ccffff, #ffcccc ); animation-name: fade; animation-duration: 3s; } @keyframes fade { 50% { left: 60%; } }

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36 Edg/94.0.992.50

Challenge: Create Visual Direction by Fading an Element from Left to Right

Link to the challenge:

  • as required on instructions you should add opacity: 0.1; like the code below

@keyframes fade {
50% {
left: 60%;
opacity: 0.1;

Hi, yes I understand that and I can pass the exercise no problem but I like to go deeper and understand the whole code. Why are we using percentage in this lesson when the previous lesson used pixels for the offsets. & Why does it start at 50% instead of 0%

It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge.

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