diff --git a/core/css/header.scss b/core/css/header.scss
index a4e568244a064063dd20283ad23d3b59b8c14e08..5cbcad1f88c7ecb8b692add833276b878c90b8c5 100644
--- a/core/css/header.scss
+++ b/core/css/header.scss
@@ -111,7 +111,8 @@
 	}
 
 	div.header-left {
-		flex: 0 0 50%;
+		flex: 0 0;
+		flex-grow: 1;
 	}
 
 	#header-right {