fix(buttons): outline variations missing style with wp 6.6

src/scss/blocks/_blocks.scss

@@ -26,6 +26,7 @@
 @import url('./jetpack/_top-posts.scss');
 @import url('./newspack/_author-list.scss');
 @import url('./newspack/_author-profile.scss');
+@import url('./newspack/_donate.scss');
 @import url('./newspack/_homepage-articles.scss');
 @import url('./newspack/_newsletters-subscribe.scss');
 @import url('./newspack/_post-carousel.scss');

src/scss/blocks/_button.scss

@@ -8,6 +8,7 @@
 }
 
 .wp-block-button {
+	form .wp-block-button__link,
 	> .wp-block-button__link {
 		transition:
 			background-color 125ms ease-in-out,
@@ -57,6 +58,10 @@
 	&.is-style-outline {
 		> .wp-block-button__link,
 		form .wp-block-button__link {
+			background: var(--wp--preset--color--base);
+			border: 1px solid currentcolor;
+			color: var(--wp--preset--color--accent);
+
 			&:hover {
 				background: var(--wp--preset--color--base-2);
 				color: var(--wp--preset--color--contrast);

src/scss/blocks/newspack/_donate.scss

@@ -0,0 +1,15 @@
+.wp-block-newspack-blocks-donate {
+	&.is-style-modern {
+		&.wpbnbd--tiers-based {
+			.wpbnbd__tiers__tier:not(& .wpbnbd__tiers__tier--recommended) {
+				button[type='submit'],
+				.submit-button {
+					&:hover {
+						border-color: currentcolor !important;
+						color: var(--newspack-ui-color-neutral-90, #1e1e1e) !important;
+					}
+				}
+			}
+		}
+	}
+}