[fix] video tag (#487)

scripts/tags/lib/video.js

@@ -14,8 +14,7 @@ module.exports = ctx => function(args) {
     args.width = '100%'
   }
   if (args.bilibili) {
-    return `
-    <div class="tag-plugin video" style="aspect-ratio:${args.ratio || 16/9};max-width:${args.width};">
+    return `<div class="tag-plugin video" style="aspect-ratio:${args.ratio || 16 / 9};max-width:${args.width};">
     <iframe src="https://player.bilibili.com/player.html?bvid=${args.bilibili}&autoplay=${args.autoplay || 'false'}" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true">
     </iframe>
     </div>

source/css/_components/tag-plugins/media.styl

@@ -1,6 +1,6 @@
 .tag-plugin.video
   line-height: 0
-  text-align: center
+  margin: auto
   video, iframe
     border-radius: $border-card
     box-shadow: $boxshadow-card-float