sticky menu has blank

Hi,

I installed JA Simpli withJoomla! 3.9.21.
When access by mobile device, sticky menu has some blank under site slogan.
I want to delete this blank.

I get two captures iPhone SE and Sony Xperia.
Same issue happend on live demo site.
https://ja-simpli.demo.joomlart.com/

Please advise me.

You can try with this custom css:

@media (max-width: 480px) {
#mainnav.stick-on-top {
    top: 104px !important;
}
}

and adjust the top value to suit your need.

I tried your code. As a result, my trouble gone cleared.
But why 104px??

Thanks.

shige-p But why 104px??

It's exactly distance from the top to the mainnav.

Glad to hear that it helped.