diff --git a/phpBB/adm/style/acp_users_signature.html b/phpBB/adm/style/acp_users_signature.html
index fff75c993d..5b5c3ecf7f 100644
--- a/phpBB/adm/style/acp_users_signature.html
+++ b/phpBB/adm/style/acp_users_signature.html
@@ -87,7 +87,7 @@
 		</div>
 		<!-- EVENT acp_users_signature_editor_buttons_after -->
 
-		<dl>
+		<dl class="responsive-columns">
 			<dt style="width: 90px;" id="color_palette_placeholder" data-orientation="v" data-height="12" data-width="15" data-bbcode="true">
 			</dt>
 			<dd style="margin-{S_CONTENT_FLOW_BEGIN}: 90px;"><textarea name="signature" rows="10" cols="60" style="width: 95%;" onselect="storeCaret(this);" onclick="storeCaret(this);" onkeyup="storeCaret(this);" onfocus="initInsertions();" data-bbcode="true">{SIGNATURE}</textarea></dd>
diff --git a/phpBB/adm/style/admin.css b/phpBB/adm/style/admin.css
index ea5dc6aec6..51845e2845 100644
--- a/phpBB/adm/style/admin.css
+++ b/phpBB/adm/style/admin.css
@@ -1361,6 +1361,10 @@ fieldset dt {
 	border-left: 1px solid #CCCCCC;
 }
 
+fieldset #color_palette_placeholder {
+	padding-top: 0;
+}
+
 fieldset dd {
 	margin: 0 0 0 45%;
 	padding: 0 0 0 5px;
@@ -1427,6 +1431,10 @@ input:focus, textarea:focus {
 		width: auto;
 	}
 
+	fieldset .responsive-columns dt {
+		float: left;
+	}
+
 	.ltr fieldset dd {
 		padding-left: 20px;
 	}