Hi,
Thanks for the screenshot and the link to your site, for the first request try this css in the Enfold Theme Options ▸ General Styling ▸ Quick CSS field:

.page-id-378 #av_section_2 .av_textblock_section p {
	width: 470px;
    margin: auto;
}

For the second request try this css:

.page-id-378 #av_section_5 .avia_codeblock iframe {
	width: 100%;
}

After applying the css, please clear your browser cache and check.
Please see the screenshot in the Private Content area.

Best regards,
Mike

Hey Tilman,
First ensure that you have enabled the custom class option for menu items in the Screen Options
Then wrap the second word in your menu item with a span and the custom class line-break like this:

Allgemeinmedizin /<span class="line-break">Naturheilkunde</span>

and add the custom class line-break-item to the menu item:

Then add this CSS to your Enfold Theme Options ▸ General Styling ▸ Quick CSS field:

#avia-menu .line-break-item a {
	line-height: 40px;
	transform: translateY(18%);
}
.line-break-item .line-break {
    display: block;
	line-height: 0px;
}

Now the menu item will be two lines and centered:

I was testing with the default settings for the 2017 Demo, since your settings may be a little different you can adjust the CSS to place the menu text where you wish, if you have trouble link to your page with an admin login so we can assist.

Best regards,
Mike

Hey hochenb,
Thank you for your question, mobile browsers such as Safari and Chrome block background videos from auto-playing, this has been the standard for for many years, this is why there is a notice in the elements:

Some plugins offer “Hacks” around this, but Safari and Chrome block more of these “Hacks” with each update, Enfold follows the browser rules and doesn’t add these “Hacks”
The LayerSlider may play a background video on mobile devices, but it is unknown how long this will work.

As for the fallback image not loading on tablets, I tested this with the color section, I added a Background Video and checked the option Hide Video On Mobile Devices:

then I added a Custom Background Image for mobile & tablets:

Now on desktop the background video plays:

and on tablet the background image shows:

below I have linked to my test page, are these the steps you tried, if not please explain and link to your test page.
I will point out that I don’t have an actual tablet device so I tested with the Dev Tools in Chrome and BrowserStack.com which uses real devices, the standard iPad showed the background image:

and the iPad Pro showed the background video, so that was an added bonus:

Best regards,
Mike

Hi,
This doesn’t change the Site Layout, it only changes it for the one page that you are working on, all other pages will not be changed.
For this one page above you wrote that you want a completely empty page, so you don’t want the menu in the right sidebar correct?
I believe that you are not seeing the above backend page admin sidebar because you have customized the options, perhaps with the plugin Admin Menu Editor or perhaps with a function in your child theme functions.php, I’m not familiar with the customizations that you have made but you admin menu options are quite different that the normal options. Try restoring the default page options.

Best regards,
Mike

Hi,
Glad to hear that you have this sorted out, if you have any further questions please create a new thread and we will gladly try to help you. Thank you for using Enfold.

Best regards,
Mike

Hi,
Glad we were able to help, if you have any further questions please create a new thread and we will gladly try to help you. Thank you for using Enfold.

Best regards,
Mike

Hey Stephen,
This error means that you are using the theme plus documentation zip file, not the installable theme zip file, as you see when you extract the file it includes extra files and folders:

You want to use the install-only zip file, or extract the “enfold.zip” from your zip and install it, I did this for you.

Best regards,
Mike

Hi,
To have one page completely blank, you can remove the sidebar, footer, title, & header all from the Layout options in the backend of each page individually:
Sidebar Settings ▸ No Sidebar
Footer Settings ▸ Don’t display the socket & footer widgets
Title Bar Settings ▸ Hide Both
Header visibility and transparency ▸ Hide Header on this page

Best regards,
Mike

Hi,
Glad we were able to help, if you have any further questions please create a new thread and we will gladly try to help you. Thank you for using Enfold.

Best regards,
Mike

Hi,
Thank for the login, I see in your child theme you have a script to replace H2 tags with H1:

/*H2 to H1*/
function replace_h2_on_single_events(){
?>
<script>
  (function( $ ) {
	$(document).ready(function() {       	
		$('.av-single-event-content h2').replaceWith(function(){
		   $newTag = $("<h1>", {html: $(this).html()});
		   $.each(this.attributes, function(i, attribute){
		        $newTag.attr(attribute.name, attribute.value);
		  });
		  return $newTag;
		})
	 });
  }(jQuery)); 
</script>
<?php
}
add_action('wp_footer', 'replace_h2_on_single_events');

When I disable this script the issue is solved, If you want to use this script please try making it more specific as to which tags to change.

Best regards,
Mike

Hi,
Thanks for the login, I added this code to your child theme functions.php:

add_filter( 'the_excerpt', 'do_shortcode');

and now the buttons show instead of the shortcode:

Best regards,
Mike

Hi,
If you want the background color of the button to be white on hover and the button text to remain the same, try this css:

#main .alternate_color input[type=submit]:hover {
    background-color: #fff;
    color: #234029;
}

After applying the css, please clear your browser cache and check.

Best regards,
Mike

Hi,
Correct, unless there is anything else we can help with on this issue, shall we close this then?

Best regards,
Mike

Hi,
Glad Ismael could help, if you have any further questions please create a new thread and we will gladly try to help you. Thank you for using Enfold.

Best regards,
Mike

Hi,
As you see in the video element it requires using the YouTube link with watch?v=

I will as the team if there is a way around this and reply back.
Thank you for your patience.

Best regards,
Mike