my popup is being hidden

Not sure how to make this hero text animation responsive
h1 is a fixed width of 250px, and I animate the wrapper, title to its full width with overflow hidden. That just means that I can't have it take up the full width of the screen as it grows, I have to rely on breakpoints and fixed widths, which looks ugly (image 1 to image 2).
I feel like it definitely should be possible to make this responsive, but I feel like it's beyond me! π...
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My first solo project a google page and i need feedback plz
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