fix: chart style (#394)

diff --git a/src/views/components/dashboard/charts/chart-bar.vue b/src/views/components/dashboard/charts/chart-bar.vue
index dd193e5..b438f81 100644
--- a/src/views/components/dashboard/charts/chart-bar.vue
+++ b/src/views/components/dashboard/charts/chart-bar.vue
@@ -81,7 +81,7 @@
             fontSize: 13,
           },
           enterable: true,
-          extraCssText: 'max-height: 300px; overflow: scroll;',
+          extraCssText: 'max-height: 300px; overflow: auto;',
         },
         legend: {
           type: 'scroll',
diff --git a/src/views/components/dashboard/charts/chart-line.vue b/src/views/components/dashboard/charts/chart-line.vue
index 992c670..feef6a4 100644
--- a/src/views/components/dashboard/charts/chart-line.vue
+++ b/src/views/components/dashboard/charts/chart-line.vue
@@ -87,7 +87,7 @@
             fontSize: 13,
           },
           enterable: true,
-          extraCssText: 'max-height: 300px; overflow: scroll;',
+          extraCssText: 'max-height: 300px; overflow: auto;',
         },
         legend: {
           type: 'scroll',