diff --git a/bootstrap-toc.css b/bootstrap-toc.css
index e8a054c..f293593 100644
--- a/bootstrap-toc.css
+++ b/bootstrap-toc.css
@@ -8,50 +8,40 @@
 /* All levels of nav */
 nav[data-toggle='toc'] .nav > li > a {
   display: block;
-  padding: 4px 20px;
-  font-size: 13px;
   font-weight: 500;
   color: #767676;
+  padding: 5px 10px;
 }
+
 nav[data-toggle='toc'] .nav > li > a:hover,
 nav[data-toggle='toc'] .nav > li > a:focus {
-  padding-left: 19px;
   color: #563d7c;
   text-decoration: none;
   background-color: transparent;
   border-left: 1px solid #563d7c;
 }
-nav[data-toggle='toc'] .nav > .active > a,
-nav[data-toggle='toc'] .nav > .active:hover > a,
-nav[data-toggle='toc'] .nav > .active:focus > a {
-  padding-left: 18px;
+nav[data-toggle='toc'] .nav .active > a,
+nav[data-toggle='toc'] .nav .active:hover > a,
+nav[data-toggle='toc'] .nav .active:focus > a {
   font-weight: bold;
-  color: #563d7c;
+  color: #564d7c;
   background-color: transparent;
   border-left: 2px solid #563d7c;
 }
 
+nav[data-toggle='toc'] {
+  font-size: 18px;
+}
+
+nav[data-toggle='toc'] .nav {
+  position: relative;
+  padding-left: 7px;
+  font-size: 90%;
+}
+
 /* Nav: second level (shown on .active) */
 nav[data-toggle='toc'] .nav .nav {
   display: none; /* Hide by default, but at >768px, show it */
-  padding-bottom: 10px;
-}
-nav[data-toggle='toc'] .nav .nav > li > a {
-  padding-top: 1px;
-  padding-bottom: 1px;
-  padding-left: 30px;
-  font-size: 12px;
-  font-weight: normal;
-}
-nav[data-toggle='toc'] .nav .nav > li > a:hover,
-nav[data-toggle='toc'] .nav .nav > li > a:focus {
-  padding-left: 29px;
-}
-nav[data-toggle='toc'] .nav .nav > .active > a,
-nav[data-toggle='toc'] .nav .nav > .active:hover > a,
-nav[data-toggle='toc'] .nav .nav > .active:focus > a {
-  padding-left: 28px;
-  font-weight: 500;
 }
 
 /* from https://github.com/twbs/bootstrap/blob/e38f066d8c203c3e032da0ff23cd2d6098ee2dd6/docs/assets/css/src/docs.css#L631-L634 */
diff --git a/bootstrap-toc.js b/bootstrap-toc.js
index 7834877..f9e35ce 100644
--- a/bootstrap-toc.js
+++ b/bootstrap-toc.js
@@ -65,6 +65,11 @@
         return $li;
       },
 
+      generateEmptyNavEl: function() {
+        var $li = $('<li></li>');
+        return $li;
+      },
+
       generateNavItem: function(headingEl) {
         var anchor = this.generateAnchor(headingEl);
         var $heading = $(headingEl);
@@ -84,42 +89,52 @@
         return 1;
       },
 
-      // returns the elements for the top level, and the next below it
-      getHeadings: function($scope, topLevel) {
-        var topSelector = 'h' + topLevel;
-
-        var secondaryLevel = topLevel + 1;
-        var secondarySelector = 'h' + secondaryLevel;
+      getHeadings: function($scope, depth, topLevel) {
+        var selector = '';
+        for (var i = topLevel; i < topLevel + depth; i++) {
+          selector += 'h' + i;
+          if (i < topLevel + depth - 1)
+            selector += ',';
+        }
 
-        return this.findOrFilter($scope, topSelector + ',' + secondarySelector);
+				return this.findOrFilter($scope, selector);
       },
 
       getNavLevel: function(el) {
         return parseInt(el.tagName.charAt(1), 10);
       },
 
-      populateNav: function($topContext, topLevel, $headings) {
-        var $context = $topContext;
-        var $prevNav;
+      populateNav: function($topContext, depth, topLevel, $headings) {
+        var $contexts = new Array(depth);
+				var helpers = this;
+
+        $contexts[0] = $topContext;
 
-        var helpers = this;
-        $headings.each(function(i, el) {
-          var $newNav = helpers.generateNavItem(el);
-          var navLevel = helpers.getNavLevel(el);
+				$headings.each(function(i, el) {
+					var $newNav = helpers.generateNavItem(el);
+					var navLevel = helpers.getNavLevel(el);
+          var relLevel = navLevel - topLevel;
 
-          // determine the proper $context
-          if (navLevel === topLevel) {
-            // use top level
-            $context = $topContext;
-          } else if ($prevNav && $context === $topContext) {
-            // create a new level of the tree and switch to it
-            $context = helpers.createChildNavList($prevNav);
-          } // else use the current $context
+          for (var i = relLevel + 1; i < $contexts.length; i++) {
+            $contexts[i] = null;
+          }
 
-          $context.append($newNav);
+          if ($contexts[relLevel] === null) {
+            for (var i = 0; i < relLevel; i++) {
+              if (!$contexts[i + 1]) {
+                if (!$contexts[i].lastNav) {
+                  var $emptyNav = helpers.generateEmptyNavEl();
+                  $contexts[i].append($emptyNav);
+                  $contexts[i].lastNav = $emptyNav;
+                }
+                $contexts[i + 1] = helpers.createChildNavList($contexts[i].lastNav);
+              }
+            }
+          }
 
-          $prevNav = $newNav;
-        });
+					$contexts[relLevel].append($newNav);
+          $contexts[relLevel].lastNav = $newNav;
+				});
       },
 
       parseOps: function(arg) {
@@ -132,6 +147,7 @@
           opts = arg;
         }
         opts.$scope = opts.$scope || $(document.body);
+        opts.depth = opts.depth || 2;
         return opts;
       }
     },
@@ -145,8 +161,8 @@
 
       var $topContext = this.helpers.createChildNavList(opts.$nav);
       var topLevel = this.helpers.getTopLevel(opts.$scope);
-      var $headings = this.helpers.getHeadings(opts.$scope, topLevel);
-      this.helpers.populateNav($topContext, topLevel, $headings);
+      var $headings = this.helpers.getHeadings(opts.$scope, opts.depth, topLevel);
+      this.helpers.populateNav($topContext, opts.depth, topLevel, $headings);
     }
   };
 
diff --git a/index.md b/index.md
index 92c6524..473b907 100644
--- a/index.md
+++ b/index.md
@@ -83,6 +83,7 @@ option | type | notes
 --- | --- | ---
 `$nav` | jQuery Object | (required) The element that the navigation will be created in.
 `$scope` | jQuery Object | The element where the search for headings will be limited to, or the list of headings that will be used in the navigation. Defaults to `$(document.body)`.
+`depth` | Integer | The number of heading classes to consider, starting from the top level. Defaults to `2`.
 {: .table }
 
 ## Customization