I am working on step - 100 of building a Penguin
.arm.left {
top: 35%;
left: 5%;
transform-origin: top left;
transform: rotate(130deg) scaleX(-1);
animation-name: 3s infinite linear;
}
** my problem with : animation-name: 3s wave infinite linear;**
Challenge: Learn CSS Transforms by Building a Penguin - Step 100
Link to the challenge:
If you use animation-name property in css only the name of the animation goes in it. Instead you can use the animation
shorthand property to set all the animation properties at once. Also, I don’t see the name of the animation in your code?
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Thanks Cryptic_X for your responded I am working on it.
just matter time, but I try to Brian storm 
Always Brainstorm it is working 
animation: wave 3s infinite linear;
You have a great coding day 
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We have blurred this solution (with [spoiler][/spoiler]
tags) so that users who have not completed this challenge can read the discussion in this thread without giving away the solution.
Ok, sound good and thinks for {spoiler tags} as well