How to create dialog box scrollable

i made a dialog box but the dialog box’s has purchase item list so there more then 500 items so i want to make that dialog box scrollable

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Set the overflow and max-width style for the modal-body element in the dialog.

For example: overflow: auto; max-height: 200px;

You can access it as dialog.wrapper.find('.modal-body')


and one more thing i want static both two field supplier and items as given in screen shot

Thank you so much that is helpful