diff --git a/resources/templates/detail.html b/resources/templates/detail.html
index 7f5f9df..0c8e6bf 100644
--- a/resources/templates/detail.html
+++ b/resources/templates/detail.html
@@ -2,7 +2,7 @@
 
 {% block content %}
 
-<div class="btn-group pull-right clearfix" role="group">
+<div class="btn-group float-right clearfix" role="group">
   {% if next-image %}
   <a class="btn btn-secondary" href="/show/{{ next-image.id }}" id="next-image">
   {% else %}
@@ -28,7 +28,7 @@
   </a>
 </div>
 
-<div class="pull-left clearfix">
+<div class="float-left clearfix">
   <h1>{{ image.title }}</h1>
   <div id="image-tags">
     {% for tag in tags %}
@@ -47,7 +47,7 @@
 
 <div id="detail-attributes">
   {% ifequal identity ":creator" %}
-  <div class="btn-group pull-right clearfix" role="group">
+  <div class="btn-group float-right clearfix" role="group">
     <a class="btn btn-primary btn-sm" href="/edit/{{ image.id }}">
       <span class="fa fa-pencil"></span>
       Bearbeiten
diff --git a/resources/templates/layout.html b/resources/templates/layout.html
index 727058b..7660efd 100644
--- a/resources/templates/layout.html
+++ b/resources/templates/layout.html
@@ -9,9 +9,9 @@
     {% endif %}
   </head>
   <body>
-    <nav class="navbar navbar-toggleable-md bg-inverse navbar-inverse">
+    <nav class="navbar navbar-expand-lg navbar-toggleable-md bg-dark navbar-dark">
       {% if identity %}
-      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
+      <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
         <span class="navbar-toggler-icon"></span>
       </button>
       {% endif %}
diff --git a/src/clj/yenu/core.clj b/src/clj/yenu/core.clj
index 513dda4..15d9999 100644
--- a/src/clj/yenu/core.clj
+++ b/src/clj/yenu/core.clj
@@ -47,14 +47,12 @@
     (log/info component "started"))
   (.addShutdownHook (Runtime/getRuntime) (Thread. stop-app)))
 
-(defn -main [& args]
-  (cond
-    (some #{"migrate" "rollback"} args)
-    (do
-      (mount/start #'yenu.config/env)
-      (image/create-needed-folders)
-      (migrations/migrate args (select-keys env [:database-url]))
-      (System/exit 0))
-    :else
-    (start-app args)))
+(defn setup-prerequisites []
+  (image/create-needed-folders)
+  (migrations/migrate ["migrate"] (select-keys env [:database-url])))
+
+(defn -main [& args]
+  (mount/start #'yenu.config/env)
+  (setup-prerequisites)
+  (start-app args))
 
diff --git a/src/clj/yenu/db/core.clj b/src/clj/yenu/db/core.clj
index f305535..4eef72f 100644
--- a/src/clj/yenu/db/core.clj
+++ b/src/clj/yenu/db/core.clj
@@ -10,3 +10,4 @@
 
 (conman/bind-connection *db* "sql/queries.sql")
 
+
diff --git a/src/clj/yenu/layout.clj b/src/clj/yenu/layout.clj
index 0e6c7b3..c905a6d 100644
--- a/src/clj/yenu/layout.clj
+++ b/src/clj/yenu/layout.clj
@@ -22,7 +22,7 @@
 (filter/add-filter! :parse-date #(time/to-time-zone (time-format/parse %) (time/default-time-zone)))
 
 (defn footer []
-  (if (= (:count (db/get-image-count) 0))
+  (if (= (:count (db/get-image-count)) 0)
     (clojure.string/join ", " (:authors env))
     (let [first-year (subs (:created_at (db/get-first-year)) 0 4)
           recent-year (subs (:created_at (db/get-recent-year)) 0 4)
diff --git a/src/clj/yenu/routes/core.clj b/src/clj/yenu/routes/core.clj
index 25bb50c..7c5e1f0 100644
--- a/src/clj/yenu/routes/core.clj
+++ b/src/clj/yenu/routes/core.clj
@@ -30,7 +30,7 @@
   (if (< num 2)
     ""
     (h/html
-     [:nav.pull-right.clearfix {:aria-label "Page navigation"}
+     [:nav.float-right.clearfix {:aria-label "Page navigation"}
       [:ul.pagination.hidden-sm-down
        (page (dec current) (= current 1) "disabled" (h/html [:span.fa.fa-arrow-left] " Zurück"))
        (cond
