You can try to override with this custom CSS rule:
#gk-Fixed-Menu {
background: #fff;
position: fixed;
top: -80px;
z-index: 1001;
}
#gk-Fixed-Menu.active {
border-bottom: 1px solid #e5e5e5;
-webkit-box-shadow: 0 0 3px rgba(0, 0, 0, 0.15);
-moz-box-shadow: 0 0 3px rgba(0, 0, 0, 0.15);
box-shadow: 0 0 3px rgba(0, 0, 0, 0.15);
line-height: 54px;
top: 0;
-webkit-transition: top .2s ease-out;
-moz-transition: top .2s ease-out;
-ms-transition: top .2s ease-out;
-o-transition: top .2s ease-out;
transition: top .2s ease-out;
width: 100%;
}
div#gk-Fixed-Menu {
display: block !important;
}