client/css/bootstrap/mixins/nav-vertical-align.styl
// Navbar vertical align
//
// Vertically center elements in the navbar.
// Example an element has a height of 30px, so write out `.navbar-vertical-align(30px),` to calculate the appropriate top margin.
navbar-vertical-align($element-height)
margin-top (($navbar-height - $element-height) / 2)
margin-bottom (($navbar-height - $element-height) / 2)