Fix button layout

browser/main/Detail/NoteDetailInfo.styl

@@ -15,20 +15,19 @@ $info-margin-under-border = 27px
   float left
   padding 0 5px
   margin 0px 2px
-
 .info-left-top
   display inline-block
   height $info-height
   line-height $info-height
 
 .info-left-top-folderSelect
-  display inline-block
   padding 0 3px
   height 34px
   line-height 26px
-  vertical-align middle
+  display flex
+  align-items center
+  justify-content center
   border-radius 3px
-
 .info-left-button
   width 34px
   height 34px
@@ -45,7 +44,7 @@ $info-margin-under-border = 27px
     border-color $ui-favorite-star-button-color
   &:active, &:active:hover
     background-color $ui-favorite-star-button-color
-    color $ui-button--active-color
+    color $ui-button--
 
 .info-right
   position absolute
@@ -56,16 +55,7 @@ $info-margin-under-border = 27px
   padding-left 30px
 
 .undo-button
-  position relative
-  border solid 1px transparent
-  line-height 34px
-  vertical-align middle
-  border-radius 2px
-  transition 0.15s
-  user-select none
-  cursor pointer
-  &:hover
-    background-color #D9D9D9
+  topBarButtonLight()
 
 body[data-theme="dark"]
   .info
@@ -86,3 +76,6 @@ body[data-theme="dark"]
 
   .info-right
     background-color $ui-dark-noteDetail-backgroundColor
+
+  .undo-button
+    topBarButtonDark()