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it doesn’t work properly yet,,, but I forgot to tell you that I am using my own CSS (copied from the original, as child theme).
Is this why it’s not working ?

OK,,,, so I’ve added below CSS and it got pretty close,,,,
The last thing to be resolved is to kill the space between menu list (after click on menu toggle, menu list shows up).
Can anybody help??

https://www.at-newyork-hotel.com

@media (max-width: 767px){
.kad-header-left {
width: 80%;
}
}
header .nav-trigger .nav-trigger-case {
top: -50px;
position: absolute;
}
#kad-mobile-nav {
margin-top: 0px;
}

@media (max-width: 480px) {
.kad-retina-logo {
width: 70%;
}
}
@media (max-width: 767px) {
.wrap.clearfix.contentclass.hfeed {
margin-top: -40px;
}
}