diff --git a/htdocs/theme/eldy/style.css.php b/htdocs/theme/eldy/style.css.php
index e1bb49ae46e..ae1ffa0ae99 100644
--- a/htdocs/theme/eldy/style.css.php
+++ b/htdocs/theme/eldy/style.css.php
@@ -1815,8 +1815,13 @@ form#login {
 	padding-top:16px;
 	padding-bottom:12px;
 	max-width: 560px;
-
-	background-color: #FFFFFF;
+<?php
+if (! empty($conf->global->MAIN_LOGIN_BACKGROUND)) {
+	print '	background-color: rgba(255, 255, 255, 0.8);';
+} else {
+	print '	background-color: #FFFFFF;';
+}
+?>
 
 	-webkit-box-shadow: 0 2px 23px 2px rgba(0, 0, 0, 0.2), 0 2px 6px rgba(60,60,60,0.15);
 	box-shadow: 0 2px 23px 2px rgba(0, 0, 0, 0.2), 0 2px 6px rgba(60,60,60,0.15);