diff --git a/basetheme_bootstrap/static/css/basetheme_bootstrap4_pasteur.css b/basetheme_bootstrap/static/css/basetheme_bootstrap4_pasteur.css
index fb2a3c8384a4529da4ee4ad4ebd4b11eec4af720..a708346249d6f9153b267f6fcc2d9ed3e46af210 100644
--- a/basetheme_bootstrap/static/css/basetheme_bootstrap4_pasteur.css
+++ b/basetheme_bootstrap/static/css/basetheme_bootstrap4_pasteur.css
@@ -129,8 +129,10 @@ header .dropdown.show>a {
     /*margin-right: 20px;*/
     padding: 15px 1rem;
 }
+.header__nav .navbar-nav,
 .header__nav>.main-nav{
     display: flex;
+    flex-direction: row;
 }
 .header__nav>.main-nav>*:not(.navbar-right){
     flex:1 1 auto;