woocommerce/plugins/woocommerce-admin/client/embedded-body-layout/style.scss

.woocommerce-embedded-layout__primary {
	padding: 0 20px;

	.components-card__header {
		box-sizing: border-box;
	}

	.components-card__footer {
		box-sizing: border-box;
	}
}
@media (max-width: #{ ($break-medium) }) {
	.woocommerce-embedded-layout__primary {
		padding: 0;
	}
}