Adding buttons

You need to start by fixing the mark-up errors –

http://validator.w3.org/check?uri=http%3A%2F%2Fforyourprivilegedpets.com%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

http://codex.wordpress.org/Validating_a_Website

The second link above explains some – there isn’t an easy way – you need to use the validator results to look at the generated code from the page you’ve validated – use View Source in your browser to see the code. Then you have to track down where that code is coming from – it looks like those errors are in the header.php file – if you have changed that file, that’s probably why, but some plugins can do that and it’s possible the theme has code errors.

I mentioned this because of what Andrew said about the code being messed up in your header section.

If you’ve changed the header.php file, you could try comparing your file with a new copy (download the theme to your local computer).

And really, you should not modify theme files…but use a Child Theme instead.

See if adding this to your custom CSS will work:

@media (max-width: 800px) {
  a.maxbutton-1, .maxbutton-6-container {
     display: none !important;
}

}