diff --git a/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php b/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php
index a92e34260..cbb4c5a39 100644
--- a/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php
+++ b/datamodels/2.x/itop-portal-base/portal/config/legacy_silex_compat_layer.php
@@ -64,7 +64,7 @@ foreach ($aPortalConf['properties']['themes'] as $sKey => $value)
 {
 	if (!is_array($value))
 	{
-		$aPortalConf['properties']['themes'][$sKey] = $_ENV['COMBODO_ABSOLUTE_URL'].utils::GetCSSFromSASS('env-'.utils::GetCurrentEnvironment().'/'.$value,
+		$aPortalConf['properties']['themes'][$sKey] = utils::GetCSSFromSASS('env-'.utils::GetCurrentEnvironment().'/'.$value,
 				$aImportPaths);
 	}
 	else
@@ -72,7 +72,7 @@ foreach ($aPortalConf['properties']['themes'] as $sKey => $value)
 		$aValues = array();
 		foreach ($value as $sSubValue)
 		{
-			$aValues[] = $_ENV['COMBODO_ABSOLUTE_URL'].utils::GetCSSFromSASS('env-'.utils::GetCurrentEnvironment().'/'.$sSubValue,
+			$aValues[] = utils::GetCSSFromSASS('env-'.utils::GetCurrentEnvironment().'/'.$sSubValue,
 					$aImportPaths);
 		}
 		$aPortalConf['properties']['themes'][$sKey] = $aValues;
diff --git a/datamodels/2.x/itop-portal-base/portal/templates/layout.html.twig b/datamodels/2.x/itop-portal-base/portal/templates/layout.html.twig
index 681a1eaf0..e58e36a8e 100644
--- a/datamodels/2.x/itop-portal-base/portal/templates/layout.html.twig
+++ b/datamodels/2.x/itop-portal-base/portal/templates/layout.html.twig
@@ -51,9 +51,9 @@
 		<link href="{{ app['combodo.absolute_url'] ~ 'css/c3.min.css'|add_itop_version }}" rel="stylesheet">
 		<link href="{{ app['combodo.absolute_url'] ~ 'js/ckeditor/plugins/codesnippet/lib/highlight/styles/obsidian.css'|add_itop_version }}" rel="stylesheet">
 		{# - Bootstrap theme #}
-		<link href="{{ app['combodo.portal.instance.conf'].properties.themes.bootstrap|add_itop_version }}" rel="stylesheet" id="css_bootstrap_theme">
+		<link href="{{ app['combodo.absolute_url'] ~ app['combodo.portal.instance.conf'].properties.themes.bootstrap|add_itop_version }}" rel="stylesheet" id="css_bootstrap_theme">
 		{# - Portal adjustments for BS theme #}
-		<link href="{{ app['combodo.portal.instance.conf'].properties.themes.portal|add_itop_version }}" rel="stylesheet" id="css_portal">
+		<link href="{{ app['combodo.absolute_url'] ~ app['combodo.portal.instance.conf'].properties.themes.portal|add_itop_version }}" rel="stylesheet" id="css_portal">
 		{# UI Extensions CSS, in an undefined order #}
         {% if app['ui_extensions_helper'].css_files is defined %}
             {% for css_file in app['ui_extensions_helper'].css_files %}