Twenty Seventeen: Resolves calendar block header cells not centering.

The calendar header block cells were not centered. This resolves that both in front and back.

Props nkeller15, sabernhardt, shailu25.
Fixes #58547.


git-svn-id: https://develop.svn.wordpress.org/trunk@58461 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentyseventeen/assets/css/blocks.css

@@ -196,6 +196,12 @@ p.has-drop-cap:not(:focus)::first-letter {
 	text-align: right;
 }
 
+/* Calendar */
+
+.wp-block-calendar th {
+	text-align: center;
+}
+
 /*--------------------------------------------------------------
 4.0 Blocks - Layout Elements
 --------------------------------------------------------------*/

src/wp-content/themes/twentyseventeen/assets/css/editor-blocks.css

@@ -709,6 +709,12 @@ table.wp-block-table td:last-child {
 	text-align: right;
 }
 
+/* Calendar */
+
+.editor-styles-wrapper .wp-block-calendar th {
+	text-align: center;
+}
+
 /* Verse */
 
 .editor-styles-wrapper .wp-block-verse {