Add this code to the Custom CSS section of your theme’s Site Options Panel to create a fixed top-toolbar.
For Karma Theme:
.top-block {
position:fixed !important;
width:100% !important;
top:0px;
z-index:999 !important;
}
body {
margin-top: 30px;
}
For Sterling Theme:
.top-aside {
box-shadow:0px 2px 3px #000 !important;
position:fixed !important;
top:0px;
width:100% !important;
z-index:999 !important;
}