update danmuku.js

packages/artplayer/src/style/bottom.less

@@ -168,6 +168,15 @@
                 display: flex;
             }
 
+            .art-controls-center {
+                flex: 1;
+                height: 100%;
+                display: flex;
+                align-items: center;
+                justify-content: center;
+                padding: 0 10px;
+            }
+
             .art-controls-right {
                 justify-content: flex-end;
             }