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Pop-up / Modal for first time visitor, Flicker issue

Hi there,

I have a modal that is showing only for first time visitor. I added a javascript code in the head of every page. The modal is working well but I notice that there is a glitch, the page flickers for a few millisecond when loading.

Anyone able to help and point me to the right direction please?

It’s noticeable on the live site. https://www.mammoth.design/