diff --git a/web/views/SubscriptionForm.vue b/web/views/SubscriptionForm.vue
index 8eb7a43..dd0f3dc 100644
--- a/web/views/SubscriptionForm.vue
+++ b/web/views/SubscriptionForm.vue
@@ -281,17 +281,24 @@ input {
   background: var(--c-bg);
 }
 
-/* 输入框加单位后缀：数字和它的量纲摆在一起 */
+/* 单位画在输入框内侧右缘：框和其它行齐宽，数字和量纲还在一起 */
 .with-unit {
-  display: flex;
-  align-items: center;
-  gap: var(--s-2);
+  position: relative;
+}
+
+.with-unit input {
+  width: 100%;
+  padding-right: 2.4em;
 }
 
 .unit {
-  flex: none;
-  color: var(--c-text-soft);
+  position: absolute;
+  right: var(--s-3);
+  top: 50%;
+  transform: translateY(-50%);
+  color: var(--c-text-faint);
   font-size: var(--t-sm);
+  pointer-events: none;
 }
 
 /* 开关。align-self 抵消 row 的 baseline 对齐，胶囊不该被拉到文字基线上 */