Hello @mironkedz,
Thanks for writing in!
The black bar is coming because of horizontal scroll on the website. However, I see that you are using Cornerstone on the website and default WordPress Twenty sixteen theme.
Further checking the code I see that the horizontal scroll and black bar is coming because of following code:
#metaslider_container_235 {
margin-right: -60px;
}
.content-area-wide {
float: center;
margin-right: -100%;
margin-left: -10%;
width: 120%;
}
First there a CSS error as Float is never Center. To learn more, please take a look at following resource. https://www.w3schools.com/css/css_float.asp
If you would like to limit the changes to desktop screen please delete above code and use following:
@media only screen and (max-width: 600px) {
#metaslider_container_235 {
margin-right: -60px;
}
.content-area-wide {
margin-right: -100%;
margin-left: -10%;
width: 120%;
}
}
I see that you have added above codes in child theme style.css file.
Thanks.