diff --git a/src/pages/_app.tsx b/src/pages/_app.tsx
index f8df272bf..ac4c40c91 100644
--- a/src/pages/_app.tsx
+++ b/src/pages/_app.tsx
@@ -77,6 +77,11 @@ const GlobalStyles = createGlobalStyle`
     .modal {
         z-index: 2000;
     }
+    .modal-dialog-centered {
+        min-height: -webkit-calc(90% - 3.5rem);
+        min-height: -moz-calc(90% - 3.5rem);
+        min-height: calc(90% - 3.5rem);
+    }
     .modal .modal-header, .modal .modal-footer {
         border-color: #444 !important;
     }