diff --git a/data/web/templates/edit/domain-templates.twig b/data/web/templates/edit/domain-templates.twig
index 8b4b428b1..825e6674d 100644
--- a/data/web/templates/edit/domain-templates.twig
+++ b/data/web/templates/edit/domain-templates.twig
@@ -100,7 +100,7 @@
     <div class="row mb-4">
       <label class="control-label col-sm-2" for="key_size">{{ lang.admin.dkim_key_length }}</label>
       <div class="col-sm-10">
-        <select data-style="btn btn-secondary btn-sm" class="form-control" id="key_size" name="key_size">
+        <select data-style="btn btn-light" class="form-control" id="key_size" name="key_size">
           <option value="1024" data-subtext="bits" {% if template.attributes.key_size == 1024 %} selected{% endif %}>1024</option>
           <option value="2048" data-subtext="bits" {% if template.attributes.key_size == 2048 %} selected{% endif %}>2048</option>
         </select>
diff --git a/data/web/templates/modals/mailbox.twig b/data/web/templates/modals/mailbox.twig
index 07c9d10f6..8e4878ae6 100644
--- a/data/web/templates/modals/mailbox.twig
+++ b/data/web/templates/modals/mailbox.twig
@@ -479,7 +479,7 @@
           <div class="row mb-4">
             <label class="control-label col-sm-2 text-sm-end text-sm-end" for="key_size">{{ lang.admin.dkim_key_length }}</label>
             <div class="col-sm-10">
-              <select data-style="btn btn-secondary btn-sm" class="form-control" id="key_size" name="key_size">
+              <select data-style="btn btn-light" class="form-control" id="key_size" name="key_size">
                 <option data-subtext="bits" value="1024">1024</option>
                 <option data-subtext="bits" value="2048" selected>2048</option>
               </select>
@@ -618,7 +618,7 @@
           <div class="row mb-4">
             <label class="control-label col-sm-2 text-sm-end text-sm-end" for="key_size">{{ lang.admin.dkim_key_length }}</label>
             <div class="col-sm-10">
-              <select data-style="btn btn-secondary btn-sm" class="form-control" id="key_size" name="key_size">
+              <select data-style="btn btn-light" class="form-control" id="key_size" name="key_size">
                 <option data-subtext="bits">1024</option>
                 <option data-subtext="bits" selected>2048</option>
               </select>
@@ -833,7 +833,7 @@
           <div class="row mb-4">
             <label class="control-label col-sm-2 text-sm-end" for="key_size2">{{ lang.admin.dkim_key_length }}</label>
             <div class="col-sm-10">
-              <select data-style="btn btn-secondary btn-sm" class="form-control" id="key_size2" name="key_size">
+              <select data-style="btn btn-light" class="form-control" id="key_size2" name="key_size">
                 <option data-subtext="bits">1024</option>
                 <option data-subtext="bits" selected>2048</option>
               </select>