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Problem with a text box on a slider

Hi guys,

I’m having a problem with my slider and a text box: On desktop version: I want that my text block (cf attached file #1) which is in the slider 1 stays on all the 3 slides. So I set up absolute positioning and its okay, but now I want my text box to be centered and to appear exactly the same way the other text box appears on my website (cf attached file #2). And I need it to be the same visually on desktop and mobile. How can I do this? I searched a lot but never find the right way to do it…

Here is my read only link:

Thanks a lot for your time, and have all a nice day!