diff --git a/src/views/dialogs/confirm.ejs b/src/views/dialogs/confirm.ejs
index 43e890d6a..5b02484e8 100644
--- a/src/views/dialogs/confirm.ejs
+++ b/src/views/dialogs/confirm.ejs
@@ -14,7 +14,7 @@
                 <div id="confirm-dialog-custom"></div>
             </div>
             <div class="modal-footer">
-                <button class="btn btn-default btn-sm" id="confirm-dialog-cancel-button">Cancel</button>
+                <button class="btn btn-secondary btn-sm" id="confirm-dialog-cancel-button">Cancel</button>
 
                 &nbsp;
 
diff --git a/src/views/dialogs/options.ejs b/src/views/dialogs/options.ejs
index 11d086c99..94892c7a8 100644
--- a/src/views/dialogs/options.ejs
+++ b/src/views/dialogs/options.ejs
@@ -108,7 +108,7 @@
                                 <div style="display: flex; justify-content: space-between;">
                                     <button class="btn btn-primary">Save</button>
 
-                                    <button class="btn btn-default" type="button" data-help-page="Protected-notes">Help</button>
+                                    <button class="btn btn-secondary" type="button" data-help-page="Protected-notes">Help</button>
                                 </div>
                             </form>
                         </div>
@@ -125,7 +125,7 @@
                                 <div style="display: flex; justify-content: space-between;">
                                     <button class="btn btn-primary">Save</button>
 
-                                    <button class="btn btn-default" type="button" data-help-page="Note-revisions">Help</button>
+                                    <button class="btn btn-secondary" type="button" data-help-page="Note-revisions">Help</button>
                                 </div>
                             </form>
                         </div>
@@ -154,7 +154,7 @@
                                 <div style="display: flex; justify-content: space-between;">
                                     <button class="btn btn-primary">Save</button>
 
-                                    <button class="btn btn-default" type="button" data-help-page="Synchronization">Help</button>
+                                    <button class="btn btn-secondary" type="button" data-help-page="Synchronization">Help</button>
                                 </div>
                             </form>
 
@@ -164,24 +164,24 @@
 
                             <p>This will test connection and handshake to the sync server. If sync server isn't initialized, this will set it up to sync with local document.</p>
 
-                            <button id="test-sync-button" class="btn btn-default">Test sync</button>
+                            <button id="test-sync-button" class="btn btn-secondary">Test sync</button>
                         </div>
 
                         <div id="advanced" class="tab-pane">
                             <h4 style="margin-top: 0px;">Sync</h4>
-                            <button id="force-full-sync-button" class="btn btn-default">Force full sync</button>
+                            <button id="force-full-sync-button" class="btn btn-secondary">Force full sync</button>
 
                             <br/>
                             <br/>
 
-                            <button id="fill-sync-rows-button" class="btn btn-default">Fill sync rows</button>
+                            <button id="fill-sync-rows-button" class="btn btn-secondary">Fill sync rows</button>
 
                             <br/>
                             <br/>
 
                             <h4>Debugging</h4>
 
-                            <button id="anonymize-button" class="btn btn-default">Save anonymized database</button><br/><br/>
+                            <button id="anonymize-button" class="btn btn-secondary">Save anonymized database</button><br/><br/>
 
                             <p>This action will create a new copy of the database and anonymise it (remove all note content and leave only structure and metadata)
                                 for sharing online for debugging purposes without fear of leaking your personal data.</p>
@@ -190,7 +190,7 @@
 
                             <p>This will rebuild database which will typically result in smaller database file. No data will be actually changed.</p>
 
-                            <button id="vacuum-database-button" class="btn btn-default">Vacuum database</button>
+                            <button id="vacuum-database-button" class="btn btn-secondary">Vacuum database</button>
                         </div>
 
                         <div id="about" class="tab-pane">
diff --git a/src/views/setup.ejs b/src/views/setup.ejs
index 1079b27db..04ec6c748 100644
--- a/src/views/setup.ejs
+++ b/src/views/setup.ejs
@@ -49,7 +49,7 @@
                 <input type="password" class="form-control" data-bind="value: password2" placeholder="Password">
             </div>
 
-            <button type="button" data-bind="click: back" class="btn btn-default">Back</button>
+            <button type="button" data-bind="click: back" class="btn btn-secondary">Back</button>
 
             &nbsp;
 
@@ -70,7 +70,7 @@
                 <li>once you've done all this, click <a href="/">here</a></li>
             </ol>
 
-            <button type="button" data-bind="click: back" class="btn btn-default">Back</button>
+            <button type="button" data-bind="click: back" class="btn btn-secondary">Back</button>
         </div>
 
         <div data-bind="visible: step() == 'sync-from-server'">
@@ -97,7 +97,7 @@
                 <input type="password" id="password1" class="form-control" data-bind="value: password1" placeholder="Password">
             </div>
 
-            <button type="button" data-bind="click: back" class="btn btn-default">Back</button>
+            <button type="button" data-bind="click: back" class="btn btn-secondary">Back</button>
 
             &nbsp;