Hi There,
first of all thanks for your great service!
I found many answer so far in the support forum.
Apperently one thing still strucks me.
I have customised the logobar with an image.
On the PC version it all looks beautiful, but on mobile there is a big black letterbox around the picture.
My custom css are looking like this:
.x-logobar {background: url(http://ulrichstaege.de/wp-content/uploads/2017/09/Ulrich-Staege-1-2.png) no-repeat center center;background-size: 100% auto;}
body .x-brand.text {display: none;}
.x-topbar .x-social-global a {
color: red;
background-color: black;}
.x-social-global a:hover.facebook {background-color: #3b5998;color: white;}
I have also added some picture to display what I mean.
What should I do?
Thanks,
Leon 
website:
(under construction code: island)
