style(levitatedsphere): 修复悬浮球

src/components/LevitatedSphere/index.vue

@@ -126,7 +126,7 @@ export default {
     position: fixed;
     z-index: 9999;
     border-radius: 50%;
-    background-color: #ffffff;
+    background-color: var(--el-bg-color);
     box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
     display: flex;
     justify-content: center;