diff --git a/view/theme/frio/config.php b/view/theme/frio/config.php
index f016bf3dea..57417af055 100644
--- a/view/theme/frio/config.php
+++ b/view/theme/frio/config.php
@@ -158,7 +158,7 @@ function frio_form($arr)
 		'$nav_icon_color'   => array_key_exists('nav_icon_color', $disable) ? '' : ['frio_nav_icon_color', DI::l10n()->t('Navigation bar icon color '), $arr['nav_icon_color'], '', false],
 		'$link_color'       => array_key_exists('link_color', $disable) ? '' : ['frio_link_color', DI::l10n()->t('Link color'), $arr['link_color'], '', false],
 		'$background_color' => array_key_exists('background_color', $disable) ? '' : ['frio_background_color', DI::l10n()->t('Set the background color'), $arr['background_color'], '', false],
-		'$contentbg_transp' => array_key_exists('contentbg_transp', $disable) ? '' : ['frio_contentbg_transp', DI::l10n()->t('Content background opacity'), ($arr['contentbg_transp'] ?? 0) ?: 100, ''],
+		'$contentbg_transp' => array_key_exists('contentbg_transp', $disable) ? '' : ['frio_contentbg_transp', DI::l10n()->t('Content background opacity'), $arr['contentbg_transp'] ?? 100, ''],
 		'$background_image' => array_key_exists('background_image', $disable) ? '' : ['frio_background_image', DI::l10n()->t('Set the background image'), $arr['background_image'], $background_image_help, false],
 		'$bg_image_options_title' => DI::l10n()->t('Background image style'),
 		'$bg_image_options' => Image::get_options($arr),
diff --git a/view/theme/frio/style.php b/view/theme/frio/style.php
index 3d9c7743ab..0309daf94a 100644
--- a/view/theme/frio/style.php
+++ b/view/theme/frio/style.php
@@ -37,7 +37,7 @@ $nav_bg           = DI::config()->get('frio', 'nav_bg')           ?: '#708fa0';
 $nav_icon_color   = DI::config()->get('frio', 'nav_icon_color')   ?: '#ffffff';
 $link_color       = DI::config()->get('frio', 'link_color')       ?: '#6fdbe8';
 $background_color = DI::config()->get('frio', 'background_color') ?: '#ededed';
-$contentbg_transp = DI::config()->get('frio', 'contentbg_transp') ?: '';
+$contentbg_transp = DI::config()->get('frio', 'contentbg_transp') ?? 100;
 $background_image = DI::config()->get('frio', 'background_image') ?: 'img/none.png';
 $bg_image_option  = DI::config()->get('frio', 'bg_image_option')  ?: '';
 $login_bg_image   = DI::config()->get('frio', 'login_bg_image')   ?: '';
@@ -60,7 +60,7 @@ if ($uid) {
 	$nav_icon_color   = DI::pConfig()->get($uid, 'frio', 'nav_icon_color')   ?: $nav_icon_color;
 	$link_color       = DI::pConfig()->get($uid, 'frio', 'link_color')       ?: $link_color;
 	$background_color = DI::pConfig()->get($uid, 'frio', 'background_color') ?: $background_color;
-	$contentbg_transp = DI::pConfig()->get($uid, 'frio', 'contentbg_transp') ?: $contentbg_transp;
+	$contentbg_transp = DI::pConfig()->get($uid, 'frio', 'contentbg_transp') ?? $contentbg_transp;
 	$background_image = DI::pConfig()->get($uid, 'frio', 'background_image') ?: $background_image;
 	$bg_image_option  = DI::pConfig()->get($uid, 'frio', 'bg_image_option')  ?: $bg_image_option;
 	$modified         = DI::pConfig()->get($uid, 'frio', 'css_modified')     ?: $modified;