ISTWCMS-5898: provide basic styling when blockquote is in HTML, not provided by the block

src/patterns/01-core/elements/_blockquote.scss

@@ -2,6 +2,12 @@
 // Blockquote styles.
 
 :where(blockquote) {
+  &:not(.uw-blockquote) {
+    background-color: var(--gray-1);
+    color: var(--uw-black);
+    font-size: var(--font-size-4);
+    padding: var(--size-3);
+  }
   p {
     color: inherit;
     font-family: inherit;