diff --git a/biscuit/core/templates/contact_form/contact_form.html b/biscuit/core/templates/contact_form/contact_form.html
index 7e0078ab33806513f6c3d75c8e7aa827206e98cb..00a6caad94102e477bea534a638846baffcb2fe9 100644
--- a/biscuit/core/templates/contact_form/contact_form.html
+++ b/biscuit/core/templates/contact_form/contact_form.html
@@ -10,7 +10,7 @@
  <form method="post">
   {% csrf_token %}
   {% bootstrap_form form %}
-  <button type="submit" class="btn btn-secondary">
+  <button type="submit" class="btn btn-dark">
     {% blocktrans %}Send{% endblocktrans %}
   </button>
  </form>
diff --git a/biscuit/core/templates/core/edit_group.html b/biscuit/core/templates/core/edit_group.html
index 120df2fcd4c92df11c6b049bc77e96913e7f6b71..f49bcc0057c055af6200244554ef45b9c23d5658 100644
--- a/biscuit/core/templates/core/edit_group.html
+++ b/biscuit/core/templates/core/edit_group.html
@@ -12,7 +12,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form edit_group_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/edit_person.html b/biscuit/core/templates/core/edit_person.html
index 8079c2e95c8d82221add521fdc7509a547421c4d..ae0f6da794f5f3a7e3cd20ca3c9029e0b78f842c 100644
--- a/biscuit/core/templates/core/edit_person.html
+++ b/biscuit/core/templates/core/edit_person.html
@@ -18,7 +18,7 @@
   <form method="post" enctype="multipart/form-data">
     {% csrf_token %}
     {% bootstrap_form edit_person_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/edit_school.html b/biscuit/core/templates/core/edit_school.html
index 5c6421b8a8b37dc61b5fa73365481f46209f6372..f26ffce4c61c9ccaa9df5205098a74d5ea78e227 100644
--- a/biscuit/core/templates/core/edit_school.html
+++ b/biscuit/core/templates/core/edit_school.html
@@ -18,7 +18,7 @@
   <form method="post" enctype="multipart/form-data">
     {% csrf_token %}
     {% bootstrap_form edit_school_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/edit_schoolterm.html b/biscuit/core/templates/core/edit_schoolterm.html
index 23d6e443e5435cd3a8d406b3ee4dfdfb7ee9edf7..1ba2931b24a80b13eff22b6bd9900da00f312132 100644
--- a/biscuit/core/templates/core/edit_schoolterm.html
+++ b/biscuit/core/templates/core/edit_schoolterm.html
@@ -18,7 +18,7 @@
   <form method="post">
     {% csrf_token %}
     {% bootstrap_form edit_term_form %}
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Edit{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/groups.html b/biscuit/core/templates/core/groups.html
index 783adcae7c31a31db9ee1ed44debfa5fd14d8948..72b7ead8d5b3286756ca65e6bb5009d80037f846 100644
--- a/biscuit/core/templates/core/groups.html
+++ b/biscuit/core/templates/core/groups.html
@@ -11,7 +11,7 @@
 
 {% block content %}
   <div class="btn-group" role="group" aria-lable="Group actions">
-    <a href="{% url 'create_group' %}" class="btn btn-secondary">
+    <a href="{% url 'create_group' %}" class="btn btn-dark">
       {% fa 'plus' %}
     </a>
   </div>
diff --git a/biscuit/core/templates/core/persons_accounts.html b/biscuit/core/templates/core/persons_accounts.html
index f2e26bce8bbc31297e426d7886205034fb132ec1..14e2b8f42931b62ee8684cfc30bcaa61c907c1b3 100644
--- a/biscuit/core/templates/core/persons_accounts.html
+++ b/biscuit/core/templates/core/persons_accounts.html
@@ -45,7 +45,7 @@
       {% endfor %}
     </table>
 
-    <button type="submit" class="btn btn-secondary">
+    <button type="submit" class="btn btn-dark">
       {% blocktrans %}Update{% endblocktrans %}
     </button>
   </form>
diff --git a/biscuit/core/templates/core/turnable.html b/biscuit/core/templates/core/turnable.html
index e2dacd55dae33d6dee86fa6af93580e860b6a3e4..61e4b3764b6fb439cdcf0221cc6974461a168ce5 100644
--- a/biscuit/core/templates/core/turnable.html
+++ b/biscuit/core/templates/core/turnable.html
@@ -11,10 +11,10 @@
     <h2>{{ current_head }}</h2>
    </div>
    <div class="btn-group" role="group" aria-label="URL actions">
-     <a href="{{ url_prev }}" class="btn btn-secondary">
+     <a href="{{ url_prev }}" class="btn btn-dark">
        {% fa 'arrow-left' %}
      </a>
-     <a href="{{ url_next }}" class="btn btn-secondary">
+     <a href="{{ url_next }}" class="btn btn-dark">
        {% fa 'arrow-right' %}
      </a>
    </div>
diff --git a/biscuit/core/templates/registration/login.html b/biscuit/core/templates/registration/login.html
index 2a1de1d1998c990881f1b8d1bdbd00990f58e6f4..71e44b26f762457c7ca1e5bd788b870490b41f84 100644
--- a/biscuit/core/templates/registration/login.html
+++ b/biscuit/core/templates/registration/login.html
@@ -17,10 +17,10 @@
  <form method="post" action="{% url 'login' %}">
   {% csrf_token %}
   {% bootstrap_form form %}
-  <button type="submit" class="btn btn-secondary">
+  <button type="submit" class="btn btn-dark">
     {% blocktrans %}Login{% endblocktrans %}
   </button>  
-  <button type="hidden" class="btn btn-secondary">
+  <button type="hidden" class="btn btn-dark">
     {{ next }}
   </button>
  </form>