Update showpicture.vue

packages/components/ShowPicture/showpicture.vue

@@ -38,6 +38,7 @@
       transition: all cubic-bezier(0.36, 0.66, 0.04, 1) 500ms;
       position: absolute;
       width: 100%;
+      background-color: rgba(0,0,0,.5);
       //max-width: 500px;
       height: 100%;
       margin: auto;