Help with sitewide page loading issue

Site URL: https://rysechirospa.com

When my website loads sometimes it makes a black bar to the right of the page that makes it more difficult to properly scroll through the pages. It appears that it may be due to sidecar customizations, but I can’t figure out where it is coming from. It seems to be more of an issue on mobile devices, but I can get it to occur on desktops as well. See attached screenshots below. Thanks for any help!

Try adding to Home > Design > Custom CSS

@media screen and (max-width:640px) {
html, body {
	overflow-x: hidden;
}
}