diff --git a/public/dashboard/index.html b/public/dashboard/index.html
index e9af82b..f631665 100644
--- a/public/dashboard/index.html
+++ b/public/dashboard/index.html
@@ -519,7 +519,7 @@
                         formatter: function (params) {
                           let tooltipContent = '';
                           params.forEach((param) => {
-                            tooltipContent += `${param.seriesName}: ${param.value}`;
+                            tooltipContent += `<p><span style="display:inline-block;background-color: ${param.color}; width: 10px; height: 10px; margin-right: 5px;"></span>${param.seriesName}: ${param.value}</p>`;
                           });
                           return tooltipContent;
                         },