fix: Solve that can't click header item when notice component alert

source/css/_common/notification.styl

 .stun-message
-  display: flex
   position: fixed
   top: 1rem
-  left: 0
+  left: 50%
   z-index: $z-index2
-  width: 100%
+  transform: translateX(-50%)
 
 .stun-alert
   position: relative
-  margin: auto
   border-radius: 3px
   padding: 8px 12px
   line-height: 1rem