In .sticky-header ul.slimmenu
, change the styles to:
font-size:32px;
position:fixed;
top:50px;
box-shadow:none;
You want it to be 50px
from top (so it doesn't overlap the menu bar) and fixed
so it always stays there.
However, this should be put in a media query so it only applies to the mobile version. It will break the desktop version.