Upload index.less

aworld/cmd/web/webui/src/pages/components/index.less

@@ -0,0 +1,10 @@
+.tracebox {
+  padding: 16px;
+
+  .mermaid {
+    width: 80%;
+    max-width: 700px;
+    margin: 0 auto;
+    text-align: center;
+  }
+}