Hi Diana,
I see the gap 🙂
Try to add this css:
@media (min-width: 768px) {
.design-full-screen .custom-sidebar {
padding-top: 0px;
padding-bottom: 0px;
}
.single .site-content, .page .site-content {
margin-top: 0px;
}
If it happens on the mobile view as well you should use just the inner css (without the media-query).
br
Tim