tracim_v2/src/css/Folder.styl

// -----------------------------------------------------
// border management for Workspace container
border-style = 1px solid darkBlue
.folder__header
  border border-style
.file
  border border-style
.folder + .file, .file + .file
  border-bottom 0
.folder__content > .file, .folder__content > .folder
  border-bottom 0
// @TODO the very last line of file or folder has to be added a border bottom in js
// -----------------------------------------------------

folderclose()
  height 0
  visibility hidden
  opacity 0

folderopen()
  height 100%
  opacity 1
  visibility visible
  transition opacity 1s

.folder
  padding-left 30px
  & > .folder__header
    folderopen()
  & > .folder__content
    folderclose()
    & > .file, > .folder
      folderclose()
  &.active
    & > .folder__header
      .folder__header__triangleborder
        display block
        &__triangle
          display block
    & > .folder__content
      folderopen()
      & > .file, > .folder
        folderopen()

  &__header
    position relative
    display flex
    justify-content space-between
    margin-left -30px
    border-bottom 0
    background-color lightGrey
    cursor pointer
    &:hover
      background-color folder-hover
      .folder__header__triangleborder__triangle
        border-color hover-folder transparent transparent transparent
    &__triangleborder
      display none
      position absolute
      top 62px
      left -1px
      border-style solid
      border-width 25px 30px 0 30px
      border-color darkBlue transparent transparent transparent
      z-index 1
      &__triangle
        display none
        position absolute
        top -26px
        left -30px
        border-style solid
        border-width 25px 30px 0 30px
        border-color lightGrey transparent transparent transparent
    &__name
      display flex
      padding-left 5px
      &__icon
        margin auto 15px
        font-size 25px
        color darkBlue
      &__text
        margin auto 15px
        font-size 17px
        color darkBlue
      &__addbtn
        margin auto 0
        cursor pointer
        &:hover > .folder__header__name__addbtn__text
          color white
        &__text
          border 1px solid darkBlue
          background-color transparent
          color darkBlue
          font-size 17px
    &__contenttype
      display flex
      &__text
        padding 18px 15px
        font-size 17px
        color darkBlue
      &__icon
        padding 18px 5px
        font-size 17px
        color darkBlue
        & > i
          margin-right 15px

@media (max-width: max-xs)
  .folder
    &__header
      &__triangleborder
        top 59px
      &__name
        &__icon
          padding 14px 15px
          font-size 20px
        &__text
          font-size 15px
      &__contenttype
        display none