diff --git a/datamodels/2.x/authent-cas/src/CASLoginExtension.php b/datamodels/2.x/authent-cas/src/CASLoginExtension.php
index 3b8828475..a11d25519 100644
--- a/datamodels/2.x/authent-cas/src/CASLoginExtension.php
+++ b/datamodels/2.x/authent-cas/src/CASLoginExtension.php
@@ -210,9 +210,9 @@ class CASLoginExtension extends AbstractLoginFSMExtension implements iLogoutExte
 			'sLabel' => Dict::S('CAS:Login:SignIn'),
 			'sTooltip' => Dict::S('CAS:Login:SignInTooltip'),
 		);
-		$oBlockData = new LoginBlockData('cas_sso_button.html.twig', $aData);
+		$oLoginData->AddBlockData('login_sso_buttons', new LoginBlockData('cas_sso_button.html.twig', $aData));
 
-		$oLoginData->AddBlockData('login_sso_buttons', $oBlockData);
+		$oLoginData->AddBlockData('css', new LoginBlockData('cas_css.css.twig'));
 
 		return $oLoginData;
 	}
diff --git a/datamodels/2.x/authent-cas/view/cas_css.css.twig b/datamodels/2.x/authent-cas/view/cas_css.css.twig
new file mode 100644
index 000000000..ac2bb6c0a
--- /dev/null
+++ b/datamodels/2.x/authent-cas/view/cas_css.css.twig
@@ -0,0 +1,18 @@
+{# @copyright   Copyright (C) 2010-2019 Combodo SARL #}
+{# @license     http://opensource.org/licenses/AGPL-3.0 #}
+
+.cas_button {
+	width: 19em;
+	cursor: pointer;
+	margin-left: auto;
+	margin-right: auto;
+	padding: 0.5em;
+	background-color: #eee;
+	border-radius: 0.25em;
+}
+
+.cas_image {
+	height: 1em;
+	vertical-align: middle;
+	margin-right: 1em;
+}
\ No newline at end of file
diff --git a/datamodels/2.x/authent-cas/view/cas_sso_button.html.twig b/datamodels/2.x/authent-cas/view/cas_sso_button.html.twig
index ec33b4d01..005f871f2 100644
--- a/datamodels/2.x/authent-cas/view/cas_sso_button.html.twig
+++ b/datamodels/2.x/authent-cas/view/cas_sso_button.html.twig
@@ -2,10 +2,10 @@
 {# @license     http://opensource.org/licenses/AGPL-3.0 #}
 
 <tr>
-	<td style="text-align:center" colspan="2">
+	<td class="center" colspan="2">
 		<div class="sso-button">
-			<div style="width:19em; cursor: pointer; margin-left: auto; margin-right: auto; padding: 0.5em; background-color: #eee; border-radius: 0.25em;" title="{{ aData.sTooltip }}" onclick="$('#login_mode').val('{{ aData.sLoginMode }}'); $('#login_form').submit(); return false;">
-				<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 336.82 167.83" class="logo" style="height: 1em; vertical-align: middle; margin-right: 1em;">
+			<div class="cas_button" title="{{ aData.sTooltip }}" onclick="$('#login_mode').val('{{ aData.sLoginMode }}'); $('#login_form').submit(); return false;">
+				<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 336.82 167.83" class="logo cas_image">
 					<defs>
 						<style>
 							.cls-1 {