add theme

src/style/index.scss

@@ -51,13 +51,13 @@
         cursor: pointer;
 
         .art-icon-play {
+            opacity: .8;
             display: flex;
             align-items: center;
             justify-content: center;
             width: 50px;
             height: 50px;
             border-radius: 50px;
-            background: #1aafff;
         }
     }