完善文档和显示

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src/pages/demo/components/container/ghost-bs.vue

@@ -2,7 +2,7 @@
   <d2-container type="ghost" scroll>
     <template slot="header">Header</template>
     <div class="d2-pt d2-pb">
-      <el-card shadow="never">
+      <el-card shadow="never" style="width: 400px;">
         <d2-demo-article/>
       </el-card>
     </div>

src/pages/demo/components/container/ghost-slot.vue

@@ -2,7 +2,7 @@
   <d2-container type="ghost">
     <template slot="header">Header</template>
     <div class="d2-pt d2-pb">
-      <el-card shadow="never">
+      <el-card shadow="never" style="width: 400px;">
         <d2-demo-article/>
       </el-card>
     </div>

src/pages/demo/components/container/ghost.vue

@@ -1,7 +1,7 @@
 <template>
   <d2-container type="ghost">
     <div class="d2-pt d2-pb">
-      <el-card shadow="never">
+      <el-card shadow="never" style="width: 400px;">
         <d2-demo-article/>
       </el-card>
     </div>