diff --git a/cps/constants.py b/cps/constants.py
index 89810e90..c1bcbe59 100644
--- a/cps/constants.py
+++ b/cps/constants.py
@@ -113,7 +113,8 @@ del env_CALIBRE_PORT
 
 
 EXTENSIONS_AUDIO    = {'mp3', 'mp4', 'ogg', 'opus', 'wav', 'flac', 'm4a', 'm4b'}
-EXTENSIONS_CONVERT  = ['pdf', 'epub', 'mobi', 'azw3', 'docx', 'rtf', 'fb2', 'lit', 'lrf', 'txt', 'htmlz', 'rtf', 'odt']
+EXTENSIONS_CONVERT_FROM  = ['pdf', 'epub', 'mobi', 'azw3', 'docx', 'rtf', 'fb2', 'lit', 'lrf', 'txt', 'htmlz', 'rtf', 'odt','cbz','cbr']
+EXTENSIONS_CONVERT_TO  = ['pdf', 'epub', 'mobi', 'azw3', 'docx', 'rtf', 'fb2', 'lit', 'lrf', 'txt', 'htmlz', 'rtf', 'odt']
 EXTENSIONS_UPLOAD   = {'txt', 'pdf', 'epub', 'kepub', 'mobi', 'azw', 'azw3', 'cbr', 'cbz', 'cbt', 'djvu', 'prc', 'doc', 'docx',
                        'fb2', 'html', 'rtf', 'lit', 'odt', 'mp3', 'mp4', 'ogg', 'opus', 'wav', 'flac', 'm4a', 'm4b'}
 
diff --git a/cps/editbooks.py b/cps/editbooks.py
index 80cb4dc8..c152a39c 100644
--- a/cps/editbooks.py
+++ b/cps/editbooks.py
@@ -307,7 +307,7 @@ def render_edit_book(book_id):
     kepub_possible=None
     if config.config_converterpath:
         for file in book.data:
-            if file.format.lower() in constants.EXTENSIONS_CONVERT:
+            if file.format.lower() in constants.EXTENSIONS_CONVERT_FROM:
                 valid_source_formats.append(file.format.lower())
     if config.config_kepubifypath and 'epub' in [file.format.lower() for file in book.data]:
         kepub_possible = True
@@ -316,7 +316,7 @@ def render_edit_book(book_id):
 
     # Determine what formats don't already exist
     if config.config_converterpath:
-        allowed_conversion_formats = constants.EXTENSIONS_CONVERT[:]
+        allowed_conversion_formats = constants.EXTENSIONS_CONVERT_TO[:]
         for file in book.data:
             if file.format.lower() in allowed_conversion_formats:
                 allowed_conversion_formats.remove(file.format.lower())
diff --git a/cps/static/css/caliBlur.css b/cps/static/css/caliBlur.css
index 490f652f..383f7e37 100644
--- a/cps/static/css/caliBlur.css
+++ b/cps/static/css/caliBlur.css
@@ -1461,7 +1461,8 @@ body > div.container-fluid > div > div.col-sm-10 > div > form > a:hover {
     -webkit-box-shadow: 0 0 2px rgba(0, 0, 0, .35);
     box-shadow: 0 0 2px rgba(0, 0, 0, .35);
     position: relative;
-    z-index: -9
+    z-index: -9;
+    width: 150px !important;
 }
 
 #books > .cover > a, #books_rand > .cover > a, .book.isotope-item > .cover > a, body > div.container-fluid > div.row-fluid > div.col-sm-10 > div.discover > form > div.col-sm-12 > div.col-sm-12 > div.col-sm-2 > a {
diff --git a/cps/static/css/style.css b/cps/static/css/style.css
index 2294d326..3d6256b2 100644
--- a/cps/static/css/style.css
+++ b/cps/static/css/style.css
@@ -107,6 +107,11 @@ a, .danger,.book-remove, .editable-empty, .editable-empty:hover { color: #45b29d
   text-decoration: none;
 }
 
+.row.display-flex {
+  display: flex;
+  flex-wrap: wrap;
+}
+
 .container-fluid img {
   display: block;
   max-width: 100%;
@@ -116,7 +121,11 @@ a, .danger,.book-remove, .editable-empty, .editable-empty:hover { color: #45b29d
 .container-fluid .discover{ margin-bottom: 50px; }
 .container-fluid .new-books { border-top: 1px solid #ccc; }
 .container-fluid .new-books h2 { margin: 50px 0 0 0; }
-.container-fluid .book { margin-top: 20px; }
+.container-fluid .book {
+  margin-top: 20px;
+  display: flex;
+  flex-direction: column;
+}
 
 .container-fluid .book .cover {
   height: 225px;
diff --git a/cps/templates/author.html b/cps/templates/author.html
index f043e618..63dd175a 100644
--- a/cps/templates/author.html
+++ b/cps/templates/author.html
@@ -34,7 +34,7 @@
         <div id="all" class="btn btn-primary">{{_('All')}}</div>
       </div-->
     </div>
-  <div class="row">
+  <div class="row display-flex">
     {% if entries[0] %}
     {% for entry in entries %}
     <div id="books" class="col-sm-3 col-lg-2 col-xs-6 book">
diff --git a/cps/templates/discover.html b/cps/templates/discover.html
index 9abe3666..3c858feb 100644
--- a/cps/templates/discover.html
+++ b/cps/templates/discover.html
@@ -2,7 +2,7 @@
 {% block body %}
 <div class="discover load-more">
   <h2>{{title}}</h2>
-  <div class="row">
+  <div class="row display-flex">
     {% for entry in entries %}
     <div class="col-sm-3 col-lg-2 col-xs-6 book">
       <div class="cover">
diff --git a/cps/templates/grid.html b/cps/templates/grid.html
index 4aa0b7df..ce2c05ac 100644
--- a/cps/templates/grid.html
+++ b/cps/templates/grid.html
@@ -23,7 +23,7 @@
     </div>
 
     {% if entries[0] %}
-        <div id="list" class="row">
+        <div id="list" class="row display-flex">
           {% for entry in entries %}
               <div class="col-sm-3 col-lg-2 col-xs-6 book sortable" {% if entry[0].sort %}data-name="{{entry[0].series[0].name}}"{% endif %} data-id="{% if entry[0].series[0].name %}{{entry[0].series[0].name}}{% endif %}">
                   <div class="cover">
diff --git a/cps/templates/index.html b/cps/templates/index.html
index b9795b9a..7759e50c 100644
--- a/cps/templates/index.html
+++ b/cps/templates/index.html
@@ -3,7 +3,7 @@
 {% if g.user.show_detail_random() %}
 <div class="discover random-books">
   <h2 class="random-books">{{_('Discover (Random Books)')}}</h2>
-  <div class="row">
+  <div class="row display-flex">
    {% for entry in random %}
     <div class="col-sm-3 col-lg-2 col-xs-6 book" id="books_rand">
       <div class="cover">
@@ -73,7 +73,7 @@
       </div-->
     </div>
 
-  <div class="row">
+  <div class="row display-flex">
     {% if entries[0] %}
     {% for entry in entries %}
     <div class="col-sm-3 col-lg-2 col-xs-6 book" id="books">
diff --git a/cps/templates/search.html b/cps/templates/search.html
index 3b694229..905c0e6b 100644
--- a/cps/templates/search.html
+++ b/cps/templates/search.html
@@ -35,7 +35,7 @@
       </div>
   {% endif %}
 
-  <div class="row">
+  <div class="row display-flex">
     {% for entry in entries %}
     <div class="col-sm-3 col-lg-2 col-xs-6 book">
       <div class="cover">
diff --git a/cps/templates/shelf.html b/cps/templates/shelf.html
index a2655f96..425e298c 100644
--- a/cps/templates/shelf.html
+++ b/cps/templates/shelf.html
@@ -12,7 +12,7 @@
       <a id="order_shelf" href="{{ url_for('shelf.order_shelf', shelf_id=shelf.id) }}" class="btn btn-primary">{{ _('Change order') }} </a>
     {% endif %}
   {% endif %}
-  <div class="row">
+  <div class="row display-flex">
 
     {% for entry in entries %}
     <div class="col-sm-3 col-lg-2 col-xs-6 book">
diff --git a/cps/templates/shelfdown.html b/cps/templates/shelfdown.html
index b4d1594a..9ec154be 100644
--- a/cps/templates/shelfdown.html
+++ b/cps/templates/shelfdown.html
@@ -29,7 +29,7 @@
 {% block body %}
 <div class="discover">
   <h2>{{title}}</h2>
-  <div class="row">
+  <div class="row display-flex">
 
     {% for entry in entries %}
     <div class="col-sm-3 col-lg-2 col-xs-6 book">