How to stick the footer at the bottom?

And this only happens when you add the code you shared above?

Yes. And I forgot that I have one more CSS:

#page{
min-height:calc(100% - 411px);
}

I found another working CSS code:

html, body{
height:100%;
}
body{
display:table;
width:100%;
}
.site-footer{
display:table-row;
height:1px;
}

Now sticky meny is working okey :)

Awesome, glad you got it sorted :)