p5.js-web-editor/client/styles/components/_sidebar.scss

.sidebar {
  display: flex;
  flex-flow: column;
}

.sidebar__header {
  padding-right: #{6 / $base-font-size}rem;
  padding-left: #{19 / $base-font-size}rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: #{29 / $base-font-size}rem;
  min-height: #{29 / $base-font-size}rem;
  position: relative;
}

.sidebar__title {
  font-size: #{12 / $base-font-size}rem;
  display: inline-block;
  .sidebar--contracted & {
    display: none;
  }
  white-space: nowrap;
  overflow: hidden;
}

.sidebar__add {
  width: #{20 / $base-font-size}rem;
  height: #{20 / $base-font-size}rem;
  @include icon();
  .sidebar--contracted & {
    display: none;
  }
  & svg {
    width: #{10 / $base-font-size}rem;
  }
}

.sidebar__file-list {
  @include themify() {
    border-color: getThemifyVariable('ide-border-color')
  }
  border-top: 1px solid;
  .sidebar--contracted & {
    display: none;
  }
}

.sidebar__root-item {
  position: relative;
  overflow-y: auto;
  flex: 1 1 auto;
}

.sidebar__file-item {
  font-size: #{12 / $base-font-size}rem;
  cursor: pointer;
  position: relative;
  @include themify() {
    color: map-get($theme-map, 'inactive-text-color');
    &:hover > .file-item__content .sidebar__file-item-name {
      color: map-get($theme-map, 'primary-text-color');
    }
    &:hover > .file-item__content .sidebar__file-item-icon g {
      fill: map-get($theme-map, 'primary-text-color');
    }
  }
}

.sidebar__file-item--folder {
  z-index: 1;
}

// to indent each row in the file tree
// not sure how to do this in a better way
// it won't work if the file tree is too nested
.file-item__spacer {
  flex-shrink: 0;
  .sidebar__file-item & {
    width: #{19 / $base-font-size}rem;
    .sidebar__file-item & {
      width: #{39 / $base-font-size}rem;
      .sidebar__file-item & {
        width: #{59 / $base-font-size}rem;
        .sidebar__file-item & {
          width: #{79 / $base-font-size}rem;
          .sidebar__file-item & {
            width: #{99 / $base-font-size}rem;
          }
        }
      }
    }
  }
}

.file-item__content {
  display: flex;
  position: relative;
  .sidebar__file-item--selected > & {
    @include themify() {
      background-color: map-get($theme-map, 'file-selected-color');
    }
  }
  .sidebar--contracted & {
    display: none;
  }
}

.sidebar__file-item-name {
  padding: #{4 / $base-font-size}rem 0;
  .sidebar__file-item--editing & {
    display: none;
  }
  &:before {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    content: '';
    width: 100%;
  }
}

.sidebar__file-item-show-options {
  width: #{20 / $base-font-size}rem;
  height: #{20 / $base-font-size}rem;
  @include icon();
  @include themify() {
    margin-right: #{5 / $base-font-size}rem;
  }
  display: none;
  position: absolute;
  right: 0;
  .sidebar__file-item--selected > .file-item__content & {
    display: inline-block;
    .sidebar--cant-edit & {
      display: none;
    }
  }
  .sidebar__file-item:hover > .file-item__content & {
    display: inline-block;
    .sidebar--cant-edit & {
      display: none;
    }
  }
  & svg {
    width: #{10 / $base-font-size}rem;
  }
  .sidebar__file-item--open > .file-item__content & {
    display: inline-block;
  }
}

.sidebar__file-item-options {
  @extend %dropdown-open-right;
  display: none;
  width: 100%;
  max-width: #{180 / $base-font-size}rem;
  .sidebar__file-item--open > .file-item__content & {
    display: flex;
  }
}

.sidebar__file-item-input {
  display: none;
  padding: 0;
  border: 0;
  width: calc(100% - #{100 / $base-font-size}rem);
  .sidebar__file-item--editing & {
    display: inline-block;
  }
}

.sidebar__expand {
  @include icon();
  position: absolute;
  top: #{7 / $base-font-size}rem;
  left: #{1 / $base-font-size}rem;
  height: #{14 / $base-font-size}rem;
  & svg {
    height: #{14 / $base-font-size}rem;
  }
  display: none;
  .sidebar--contracted & {
    display: inline-block;
  }
}

.sidebar__contract {
  @include icon();
  position: absolute;
  top: #{7 / $base-font-size}rem;
  left: #{34 / $base-font-size}rem;
  height: #{14 / $base-font-size}rem;
  & svg {
    height: #{14 / $base-font-size}rem;
  }
  .sidebar--contracted & {
    display: none;
  }
}

.sidebar__icons {
  display: flex;
  align-items: center;
  height: 100%;
  .sidebar--cant-edit & {
    display: none;
  }
}

.sidebar__folder-icon {
  padding: #{4 / $base-font-size}rem 0;
  margin-right: #{5 / $base-font-size}rem;
  & g {
    @include themify() {
      fill: map-get($theme-map, 'primary-text-color');
    }
  }
  & svg {
    width: #{10 / $base-font-size}rem;
  }
}

.sidebar__file-item-icon {
  padding: #{4 / $base-font-size}rem 0;
  margin-right: #{5 / $base-font-size}rem;
  & g {
    @include themify() {
      fill: getThemifyVariable('inactive-text-color');
    }
  }
  & svg {
    height: #{10 / $base-font-size}rem;
  }
  background-color: transparent;
  border: none;
}

.sidebar__file-item-closed {
  @extend .sidebar__file-item-icon;
  display: none;
  .sidebar__file-item--closed & {
    display: inline-block;
  }
}

.sidebar__file-item-open {
  @extend .sidebar__file-item-icon;
  display: inline-block;
  .sidebar__file-item--closed & {
    display: none;
  }
}

.sidebar__file-item--closed .file-item__children {
  display: none;
}

.sidebar__project-options {
  @extend %dropdown-open-right;
  display: none;
  width: 100%;
  max-width: #{180 / $base-font-size}rem;
  .sidebar--project-options & {
    display: flex;
  }
}