With Border
Add a border to visually separate the form from surrounding content, especially useful when your site has a white background.
See it in action on a demo pageUse a subtle border color like lightgray or #e5e5e5 to blend with most designs without being too prominent.
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<iframe title="donation form embed" src="https://better.giving/forms/E7JXrhQifQrS9XGw2CFNm" allow="payment" width="100%" height="500" style="max-width: 700px; border: 1px solid lightgray" ></iframe>