New update.
I pressed f12 -> console to see if there were any errors. There were, 3 related to HTPS.
I went to cloudflare and disabled SSL, and everything is working. But if i put it on “Flexible”, it doesnt work. Neither works the website on full, of course.

I would like having the HTTPS, but i need to desactivate it for having the theme working. any ideas? thanks in advance

Well, seems the problems is bigger than only the validation. When i try save any “theme panel” setting, it keeps loading forever, just like the Validation.

Why is this happening?

Looking into the Style.css, it seems everything is ok: http://imgur.com/a/nPsq9
I still dunno what happened :/ I have searched for “transparent” but everything seems irrelevant so far

Thanks.

With that code, the problem is “solved”. But i would like to know what caused this, honestly.

Here you have the only CSS code i had: http://imgur.com/a/F7UuP

Nothing is about “transparency”, as you can see.

the web is http://www.destinodeviaje.es
If you want more access, just ask for it and i will provide it

Thanks in advance

Here you have: https://www.destinodeviaje.es/

(Website is under construction, dont panic! 😛 )

Thanks for your dedicated answer 🙂

1- The problem is, that i want (obviously) the sidebar in the desktop version. But i dont want it on the mobile version.
The code you provided will delete the sidebar everywhere, right? I want the clean version of the post pages ONLY in mobile. Is that possible?

2- Thanks, ill do that for sure 🙂

I would like an answer too, im non-stop looking for add a sidebar in the “travel-skin” homepage, and remove some things form the sidebar in the pages-template in the same skin.