Sets of free css loaders for your inspiration…No js Required. 
40+ Creative CSS Loaders
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absolute genious
Are these available for commercial use?
It looks like they’re all by different people but hosted on codepen, which means that they’re covered by the codepen license. You should look up the details of this yourself to see if it fits your project, but AFAIK it’s similar to the MIT license, meaning that you can use it in any way you like but you can’t put a different license on it.
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Related (and with live demo): Basic Loading Screen