diff --git a/htdocs/install/default.css b/htdocs/install/default.css
index c9ebc47d317..726f1d2d0c2 100644
--- a/htdocs/install/default.css
+++ b/htdocs/install/default.css
@@ -464,7 +464,8 @@ table.tablesupport {
 @media only screen and (max-width: 570px)
 {
 	.blocksupport {
-		width: 90%;
+		width: calc(100% - 4px);
+		padding: 4px;
 	}
 	
 	.tablesupport {