style: site doc css

src/sites/assets/styles/md-style.scss

@@ -54,7 +54,7 @@
       content: '';
       position: absolute;
       bottom: -26px;
-      left: 43px;
+      left: 16px;
       width: 44px;
       height: 17px;
       background: url('https://img10.360buyimg.com/imagetools/jfs/t1/136135/19/14659/946/5fa20aa8E33a9aa26/d329fbe669171208.png');