Fix dropdown appearance in safari (#688)

Author: reakaleek

src/Elastic.Markdown/Assets/markdown/dropdown.css

@@ -1,16 +1,22 @@
 @layer components {
 	.markdown-content {
-		.dropdown {
-			@apply mt-4 border-1 border-grey-20 rounded-sm shadow-xs;
-			.dropdown-title {
+
+		details > summary::-webkit-details-marker {
+			display: none;
+		}
+		
+		details.dropdown {
+			@apply mt-4 block border-1 border-grey-20 rounded-sm shadow-xs;
+			summary.dropdown-title {
 				@apply flex 
 				justify-between
 				items-center
 				px-4
 				py-2
 				cursor-pointer
-				text-ink-dark 
-				font-semibold
+				font-sans
+				font-bold
+				text-ink-dark
 				;
 			}