jQuery : how to change design of bootstrap-multiselect

jQuery : how to change design of bootstrap-multiselect
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As promised, I have a hidden feature that I want to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
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It will change your youtube progress bar into a flashing rainbow.

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jQuery : how to change design of bootstrap-multiselect
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jQuery : bootstrap-multiselect design change to how of