Skatepark: Use calc for commetlist bottom margin

skatepark/assets/theme.css

@@ -266,7 +266,7 @@
 }
 
 .wp-block-post-comments .commentlist {
-	margin-bottom: 60px;
+	margin-bottom: calc( 4 * var(--wp--custom--margin--baseline));
 }
 
 .wp-block-post-comments .commentlist .comment p {

skatepark/sass/blocks/_post-comments.scss

@@ -150,7 +150,7 @@
 	}
 
 	.commentlist {
-		margin-bottom: 60px;
+		margin-bottom: calc( 4 * var(--wp--custom--margin--baseline) );
 
 		.comment p {
 			margin-bottom: var(--wp--custom--margin--vertical);