Sorry, could you point out how the HTML is invalid? Where’s the error?
Here you have the https://gist.github.com/Abd-Ur-Rehman/27ca4fbcaa24f1646ce3941e934037f9 Contact Form 7 that I added with x cols.
Furthermore, I have added that code in my child theme but it doesn’t work. How can I make it work with the child theme that I’ve created following this. https://codex.wordpress.org/Child_Themes
About the tab each one shows in one col but I’m trying to make it as in the site in notes.
Thoughts?
Thanks