app/assets/stylesheets/custom/sidebar_left.ccs.less
.sidebar > .sidebar-menu > li.sidebar-divider {
height: 10px;
margin: 0;
border-top: none;
border-bottom: none;
}
.sidebar > .sidebar-menu > li.sidebar-header {
text-transform: uppercase;
font-weight: bold;
padding-top: 8px;
padding-bottom: 2px;
padding-left: 6px;
border-top: none;
border-bottom: none;
}