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diff --git a/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/nav-vertical-align.less b/www/wiki/extensions/Bootstrap/resources/bootstrap/less/mixins/nav-vertical-align.less
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+// 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);
+}