update dist and lib

lib/components/borderBox3/src/main.vue

@@ -1,6 +1,10 @@
 <template>
   <div class="dv-border-box-3" :ref="ref">
     <svg class="dv-border-svg-container" :width="width" :height="height">
+      <polygon :fill="backgroundColor" :points="`
+        23, 23 ${width - 24}, 23 ${width - 24}, ${height - 24} 23, ${height - 24}
+      `" />
+
       <polyline class="dv-bb3-line1"
         :stroke="mergedColor[0]"
         :points="`4, 4 ${width - 22} ,4 ${width - 22}, ${height - 22} 4, ${height - 22} 4, 4`"
@@ -39,6 +43,10 @@ export default {
     color: {
       type: Array,
       default: () => ([])
+    },
+    backgroundColor: {
+      type: String,
+      default: 'transparent'
     }
   },
   data () {