woocommerce/plugins/woocommerce-blocks/assets/js/base/components/cart-checkout/no-shipping/style.scss

.components-placeholder.wc-block-checkout__no-shipping {
	margin-bottom: $gap;

	.components-placeholder__fieldset {
		display: block;

		.components-button {
			background-color: $black;
			color: $white;
		}

		.wc-block-checkout__no-shipping-description {
			display: block;
			margin: 0.25em 0 1em 0;
			font-size: 13px;
		}
	}
}