diff --git a/src/modules/05_placement/components/probation/MainDetail.vue b/src/modules/05_placement/components/probation/MainDetail.vue
index 5a90eb554..8f101da7d 100644
--- a/src/modules/05_placement/components/probation/MainDetail.vue
+++ b/src/modules/05_placement/components/probation/MainDetail.vue
@@ -101,7 +101,7 @@ const clickBack = () => {
         class="bg-grey-1"
         bordered
       >
-        <q-scroll-area class="fit" :horizontal-thumb-style="{ opacity: 0 }">
+        <q-scroll-area class="fit" :horizontal-thumb-style="{ opacity: '0' }">
           <q-list class="text-grey-9">
             <q-item
               active-class="text-primary bg-teal-1 text-weight-medium"