diff --git a/biscuit/apps/exlibris/templates/exlibris/add_book.html b/biscuit/apps/exlibris/templates/exlibris/add_book.html
index 759db5a2ff2a5011372d41ed86cb04e14a79952e..74bc2af6b360190129dcdc8c2cd7f79c2f64c098 100644
--- a/biscuit/apps/exlibris/templates/exlibris/add_book.html
+++ b/biscuit/apps/exlibris/templates/exlibris/add_book.html
@@ -11,7 +11,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form book_add_isbn_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Add{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/apps/exlibris/templates/exlibris/add_book_copies.html b/biscuit/apps/exlibris/templates/exlibris/add_book_copies.html
index 1479cbf9ccacfb20991cd251bf03bb205e9b666d..d92c230812ec8f4eae9bcd07696d33a92a437c75 100644
--- a/biscuit/apps/exlibris/templates/exlibris/add_book_copies.html
+++ b/biscuit/apps/exlibris/templates/exlibris/add_book_copies.html
@@ -12,7 +12,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form bulk_add_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Bulk add{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/apps/exlibris/templates/exlibris/book_full.html b/biscuit/apps/exlibris/templates/exlibris/book_full.html
index 9b98bf427f44801beb4c08f2fe075ebfe0ba9381..cbcf1cef67ceaa0fbbf28aeb3f6b186e6cf51034 100644
--- a/biscuit/apps/exlibris/templates/exlibris/book_full.html
+++ b/biscuit/apps/exlibris/templates/exlibris/book_full.html
@@ -17,7 +17,7 @@
       <h1>{{ book.title }}</h1>
     </div>
     <div class="btn-group" role="group" aria-label="Book actions">
-      <a href="{% url 'edit_book_by_id' id_=book.id %}" class="btn btn-secondary">
+      <a href="{% url 'edit_book_by_id' id_=book.id %}" class="btn btn-dark">
         {% fa 'pencil' %}
       </a>
     </div>
@@ -56,10 +56,10 @@
       <h2>{% blocktrans %}Copies{% endblocktrans %}</h2>
     </div>
     <div class="btn-group" role="group" aria-label="Book actions">
-      <a href="{% url 'add_copies_by_book_id' id_=book.id %}" class="btn btn-secondary">
+      <a href="{% url 'add_copies_by_book_id' id_=book.id %}" class="btn btn-dark">
         {% fa 'plus' %}
       </a>
-      <a href="{% url 'copies_labels_by_book_id' id_=book.id %}" class="btn btn-secondary">
+      <a href="{% url 'copies_labels_by_book_id' id_=book.id %}" class="btn btn-dark">
         {% fa 'barcode' %}
       </a>
     </div>
diff --git a/biscuit/apps/exlibris/templates/exlibris/copy_full.html b/biscuit/apps/exlibris/templates/exlibris/copy_full.html
index 566533babac025bd00d600d6873303b0f5f4c62a..1117ec6edaa6c72fdadc9efe039768e7e3a50296 100644
--- a/biscuit/apps/exlibris/templates/exlibris/copy_full.html
+++ b/biscuit/apps/exlibris/templates/exlibris/copy_full.html
@@ -17,7 +17,7 @@
       <h1>{{ book_copy.book.title }}</h1>
     </div>
     <div class="btn-group" role="group" aria-label="Book actions">
-      <a href="{% url 'edit_book_copy_by_id' id_=book_copy.id %}" class="btn btn-secondary">
+      <a href="{% url 'edit_book_copy_by_id' id_=book_copy.id %}" class="btn btn-dark">
         {% fa 'pencil' %}
       </a>
     </div>
diff --git a/biscuit/apps/exlibris/templates/exlibris/edit_book.html b/biscuit/apps/exlibris/templates/exlibris/edit_book.html
index 3af70c3489c1ff468450fdeb4c19609809fab791..2047725917a0dc14302de41457d4ebb7f536553f 100644
--- a/biscuit/apps/exlibris/templates/exlibris/edit_book.html
+++ b/biscuit/apps/exlibris/templates/exlibris/edit_book.html
@@ -11,7 +11,7 @@
   <form method="post" enctype="multipart/form-data">
     {% csrf_token %}
     {% bootstrap_form book_edit_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Add / Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/apps/exlibris/templates/exlibris/edit_book_copy.html b/biscuit/apps/exlibris/templates/exlibris/edit_book_copy.html
index c0e4387d5fecff203f7406a69bf4030797163bfd..b4d288443b3cc1f08e953ceb1bf5eea264e7472c 100644
--- a/biscuit/apps/exlibris/templates/exlibris/edit_book_copy.html
+++ b/biscuit/apps/exlibris/templates/exlibris/edit_book_copy.html
@@ -11,7 +11,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form book_copy_edit_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Add / Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/apps/exlibris/templates/exlibris/get_copy.html b/biscuit/apps/exlibris/templates/exlibris/get_copy.html
index e5a545861d47f27a6be6a5df8cff3cb4651343d0..1c6a849070ae2330c02b1f83f4bff67ffbbba3ff 100644
--- a/biscuit/apps/exlibris/templates/exlibris/get_copy.html
+++ b/biscuit/apps/exlibris/templates/exlibris/get_copy.html
@@ -11,7 +11,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form book_copy_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Get{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/apps/exlibris/templates/exlibris/person_borrow.html b/biscuit/apps/exlibris/templates/exlibris/person_borrow.html
index 8eb305433fdf4749eff0c7533c7a4998a11c57ab..cd8238d6dd7e70293f9bf0029095f3e611ff6136 100644
--- a/biscuit/apps/exlibris/templates/exlibris/person_borrow.html
+++ b/biscuit/apps/exlibris/templates/exlibris/person_borrow.html
@@ -11,7 +11,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form person_borrow_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Borrow{% endblocktrans %}
     </button>
   </form>