I insert this code: in css custom:
.jp-slider {top: 140px;}
@media (max-width: 767px) {
.jp-slider {top:0;}
}
.jp-top-outer {background:#FFF} position:relative
.uk-navbar-toggle:after {content: "MENU";}

but I don't see the main menù in mobile version!!!!!!!!!!!

Your offcanvas is visible in mobile devices, but you made a mistake while you customize the theme.



Try this code please

.uk-navbar-toggle::after {
content: "menu";
}

Problem solved.

thanks!