style: refs #6899 fixed style

src/pages/InvoiceOut/Card/InvoiceOutSummary.vue

@@ -151,7 +151,12 @@ const ticketsColumns = ref([
                 <QTable v-if="tickets" :columns="ticketsColumns" :rows="tickets" flat>
                     <template #header="props">
                         <QTr :props="props">
-                            <QTh class="tr-header" v-for="col in props.cols" :key="col.name" :props="props">
+                            <QTh
+                                class="tr-header"
+                                v-for="col in props.cols"
+                                :key="col.name"
+                                :props="props"
+                            >
                                 {{ t(col.label) }}
                             </QTh>
                         </QTr>
@@ -180,7 +185,7 @@ const ticketsColumns = ref([
 
 <style lang="scss" scoped>
 .tr-header {
-    color: #a8a8a8;
+    color: var(--vn-label-color);
 }
 .no-uppercase {
     text-transform: none;