Add padding to comment text area

src/vs/workbench/parts/comments/electron-browser/media/review.css

@@ -160,7 +160,7 @@
 .monaco-editor .review-widget .body .comment-form.expand .monaco-editor,
 .monaco-editor .review-widget .body .comment-form.expand .form-actions {
 	display: block;
-	box-sizing: border-box;
+	box-sizing: content-box;
 }
 
 .monaco-editor .review-widget .body .comment-form .review-thread-reply-button {
@@ -191,6 +191,7 @@
 	max-height: 500px;
 	border-radius: 3px;
 	border: 0px;
+	padding: 6px 12px;
 }
 
 .monaco-editor .review-widget .body .comment-form .form-actions {