diff --git a/less/modal.less b/less/modal.less
index 9992582..35fb9a0 100644
--- a/less/modal.less
+++ b/less/modal.less
@@ -24,6 +24,7 @@
 @modal-close-position: @global-medium-gutter;
 
 .hook-modal-dialog() {
+  max-width: calc(100vw - 2*@modal-padding-horizontal-s);
   border-radius: @modal-dialog-border-radius;
 }