diff --git a/app/static/css/scodoc9_mobile.css b/app/static/css/scodoc9_mobile.css
index d4b8c521f..3dd227e00 100644
--- a/app/static/css/scodoc9_mobile.css
+++ b/app/static/css/scodoc9_mobile.css
@@ -73,6 +73,12 @@
         flex-wrap: wrap;
     }
 
+    .mass-selection .rbtn {
+        --size: 35px;
+        width: var(--size) !important;
+        height: var(--size) !important;
+    }
+
     .etud_row {
         grid-template-columns: 2% 20% auto 25% !important;
         max-width: 350px;