first commit

wp-includes/blocks/post-author/style-rtl.css

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+.wp-block-post-author{
+  box-sizing:border-box;
+  display:flex;
+  flex-wrap:wrap;
+}
+.wp-block-post-author__byline{
+  font-size:.5em;
+  margin-bottom:0;
+  margin-top:0;
+  width:100%;
+}
+.wp-block-post-author__avatar{
+  margin-left:1em;
+}
+.wp-block-post-author__bio{
+  font-size:.7em;
+  margin-bottom:.7em;
+}
+.wp-block-post-author__content{
+  flex-basis:0;
+  flex-grow:1;
+}
+.wp-block-post-author__name{
+  margin:0;
+}