Website problem on Mobile

Hey!

I’ve finished my website yesterday, apparently everything was normal, it was looking 100% great on my computer.

But when trying to access it with my mobile phone, the first of the site wasn’t showing up as it should…

as you can see in the links bellow:

this is how it looks on computer (normal!): https://ibb.co/GCLx59d
this is how it SHOULD look on mobile: https://d.pr/i/9nRaO0
and this is how it IS actually looking on mobile: https://ibb.co/hLnLhyD

as you can see, the texts are there, but they’re transparent, or something else…

I really need help with this, because I was going to show the site to the owner today, but I can’t show it like this…

I’ve entered in contact with the support on wordpress, but they’ve send me here

The page I need help with: [log in to see the link]