Add max height to modal container

Use IE specific overflow rule to show scrollbar
Set specific max height in ie only

styles/components/_modal.scss

@@ -17,6 +17,7 @@ body {
 
   .modal__container {
     height: 100vh;
+    max-height: 100vh;
   }
 
   .modal__dialog {
@@ -42,7 +43,13 @@ body {
       background-color: $color-white;
       padding: $gap * 2;
       width: 100%;
+
       overflow-y: auto;
+      -ms-overflow-style: scrollbar;
+
+      @include ie-only {
+        max-height: calc(100vh - #{$gap * 8});
+      }
 
       @include media($medium-screen) {
         padding: $gap * 4;