diff --git a/browser/main/Detail/FolderSelect.styl b/browser/main/Detail/FolderSelect.styl
deleted file mode 100644
index 0abe6589..00000000
--- a/browser/main/Detail/FolderSelect.styl
+++ /dev/null
@@ -1,132 +0,0 @@
-.root
-  position relative
-  border solid 1px transparent
-  line-height 34px
-  vertical-align middle
-  border-radius 2px
-  transition 0.15s
-  user-select none
-  &:hover
-    background-color white
-    border-color $ui-borderColor
-
-.root--search, .root--focus
-  @extend .root
-  background-color white
-  border-color $ui-input--focus-borderColor
-  &:hover
-    background-color white
-    border-color $ui-input--focus-borderColor
-
-.idle
-  position relative
-  cursor pointer
-.idle-label
-  absolute left top
-  padding 0 0 0 5px
-  right 20px
-  overflow ellipsis
-
-.idle-label-name
-  border-left solid 4px transparent
-  padding 2px 5px
-.idle-label-name-surfix
-  font-size 10px
-  color $ui-inactive-text-color
-  margin-left 5px
-.idle-caret
-  absolute right top
-  height 34px
-  width 20px
-  line-height 34px
-
-.search
-  absolute top left right bottom
-  line-height 34px
-
-.search-input
-  vertical-align middle
-  position relative
-  top -2px
-  outline none
-  border none
-  height 20px
-  line-height 20px
-  background-color transparent
-  padding 0 10px
-
-.search-optionList
-  position fixed
-  max-height 450px
-  overflow auto
-  z-index 200
-  background-color white
-  border-radius 2px
-  box-shadow 2px 2px 10px gray
-
-.search-optionList-item
-  height 34px
-  width 250px
-  box-sizing border-box
-  padding 0 5px
-  overflow ellipsis
-  cursor pointer
-  &:hover
-    background-color $ui-button--hover-backgroundColor
-
-.search-optionList-item--active
-  @extend .search-optionList-item
-  background-color $ui-button--active-backgroundColor
-  color $ui-button--active-color
-  &:hover
-    background-color $ui-button--active-backgroundColor
-    color $ui-button--active-color
-.search-optionList-item-name
-  border-left solid 4px transparent
-  padding 2px 5px
-.search-optionList-item-name-surfix
-  font-size 10px
-  color $ui-inactive-text-color
-  margin-left 5px
-
-body[data-theme="dark"]
-  .root
-    color $ui-dark-text-color
-    &:hover
-      color white
-      background-color $ui-dark-button--hover-backgroundColor
-      border-color $ui-dark-borderColor
-
-  .root--search, .root--focus
-    @extend .root
-    background-color $ui-dark-button--hover-backgroundColor
-    border-color $ui-input--focus-borderColor
-    &:hover
-      background-color $ui-dark-button--hover-backgroundColor
-      border-color $ui-input--focus-borderColor
-
-  .idle-label-name-surfix
-    color $ui-dark-inactive-text-color
-
-  .search-input
-    color white
-    background-color transparent
-    border-color $ui-dark-borderColor
-
-  .search-optionList
-    color white
-    background-color $ui-dark-button--hover-backgroundColor
-    box-shadow 2px 2px 10px black
-
-  .search-optionList-item
-    &:hover
-      background-color lighten($ui-dark-button--hover-backgroundColor, 15%)
-
-  .search-optionList-item--active
-    background-color $ui-dark-button--active-backgroundColor
-    color $ui-dark-button--active-color
-    &:hover
-      background-color $ui-dark-button--active-backgroundColor
-      color $ui-dark-button--active-color
-  .search-optionList-item-name-surfix
-    color $ui-dark-inactive-text-color