diff --git a/theme/templates/includes/book/font-settings.html b/theme/templates/includes/book/font-settings.html
index 377cf043f..422a4b6d7 100644
--- a/theme/templates/includes/book/font-settings.html
+++ b/theme/templates/includes/book/font-settings.html
@@ -1,22 +1,22 @@
 <div class="dropdown-menu font-settings">
-	<div class="dropdown-caret">
-  <span class="caret-outer"></span>
-  <span class="caret-inner"></span>
-</div>
-
-	<div class="btn-group btn-block">
-		<button id="reduce-font-size" class="btn btn-default">A</button>
-		<button id="enlarge-font-size" class="btn btn-default">A</button>
-	</div>
-
-	<ul class="list-group font-family-list">
-		<li class="list-group-item" data-font="0">Serif</li>
-		<li class="list-group-item" data-font="1">Sans</li>
-	</ul>
-
-	<div class="btn-group btn-group-xs btn-block color-theme-list">
-	  <button type="button" class="btn btn-default" id="color-theme-preview-0" data-theme="0">White</button>
-	  <button type="button" class="btn btn-default" id="color-theme-preview-1" data-theme="1">Sepia</button>
-	  <button type="button" class="btn btn-default" id="color-theme-preview-2" data-theme="2">Night</button>
-	</div>
+    <div class="dropdown-caret">
+        <span class="caret-outer"></span>
+        <span class="caret-inner"></span>
+    </div>
+
+    <div class="btn-group btn-block">
+        <button id="reduce-font-size" class="btn btn-default">A</button>
+        <button id="enlarge-font-size" class="btn btn-default">A</button>
+    </div>
+
+    <ul class="list-group font-family-list">
+        <li class="list-group-item" data-font="0">Serif</li>
+        <li class="list-group-item" data-font="1">Sans</li>
+    </ul>
+
+    <div class="btn-group btn-group-xs btn-block color-theme-list">
+        <button type="button" class="btn btn-default" id="color-theme-preview-0" data-theme="0">White</button>
+        <button type="button" class="btn btn-default" id="color-theme-preview-1" data-theme="1">Sepia</button>
+        <button type="button" class="btn btn-default" id="color-theme-preview-2" data-theme="2">Night</button>
+    </div>
 </div>