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

.sidebar__header {
  padding: #{10 / $base-font-size}rem #{6 / $base-font-size}rem;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid $ide-border-color;
  align-items: center;
  height: #{47 / $base-font-size}rem;
}

.sidebar__title {
  font-size: #{16 / $base-font-size}rem;
  display: inline-block;
  .sidebar--contracted & {
    display: none;
  }
  white-space: nowrap;
  overflow: hidden;
}

.sidebar__add {
  @extend %icon;
  cursor: pointer;
  // height: #{26 / $base-font-size}rem;
  // margin-right: #{16 / $base-font-size}rem;
  // font-size: #{24 / $base-font-size}rem;
  .sidebar--contracted & {
    display: none;
  }
}

.sidebar__file-list {
  border-top: 1px solid $ide-border-color;
  .sidebar--contracted & {
    display: none;
  }
}

.sidebar__root-item {
  position: relative;
}

.sidebar__file-item {
  font-size: #{16 / $base-font-size}rem;
  color: $light-inactive-text-color;
  cursor: pointer;
  &:hover > .file-item__content .sidebar__file-item-name {
    color: $light-primary-text-color;
  }
  &:hover > .file-item__content .sidebar__file-item-icon g {
    fill: $light-primary-text-color;
  }
}

// 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 {
  .sidebar__file-item & {
    width: #{20 / $base-font-size}rem;
    .sidebar__file-item & {
      width: #{40 / $base-font-size}rem;
      .sidebar__file-item & {
        width: #{60 / $base-font-size}rem;
        .sidebar__file-item & {
          width: #{80 / $base-font-size}rem;
          .sidebar__file-item & {
            width: #{100 / $base-font-size}rem;
          }
        }
      }
    }
  }
}

.file-item__content {
  display: flex;
  position: relative;
  padding: #{8 / $base-font-size}rem 0;
  .sidebar__file-item--selected > & {
    background-color: $ide-border-color;
  }

}

.sidebar__file-item-name {
  .sidebar__file-item--editing & {
    display: none;
  }
}

.sidebar__file-item-show-options {
  @extend %icon;
  display: none;
  position: absolute;
  right: #{20 / $base-font-size}rem;
  .sidebar__file-item--selected > .file-item__content & {
    display: inline-block;
  }
}

.sidebar__file-item-options {
  @extend %modal;
  position: absolute;
  top: 95%;
  left: 77%;
  right: -65%;
  display: none;
  z-index: 100;
  padding: #{8 / $base-font-size}rem #{16 / $base-font-size}rem;
  background-color: $light-modal-background-color;
  z-index: 100;
  .sidebar__file-item--open > .file-item__content & {
    display: block;
  }
}

.sidebar__file-item-input {
  display: none;
  padding: 0;
  border: 0;
  background-color: transparent;
  max-width: 90%;
  .sidebar__file-item--editing & {
    display: inline-block;
  }
}

.sidebar__contract {
  @extend %icon;
  margin-left: #{4 / $base-font-size}rem;
  height: #{14 / $base-font-size}rem;
  & svg {
    height: #{14 / $base-font-size}rem;
  }
  .sidebar--contracted & {
    display: none;
  }
}

.sidebar__expand {
  @extend %icon;
  height: #{14 / $base-font-size}rem;
  & svg {
    height: #{14 / $base-font-size}rem;
  }
  display: none;
  .sidebar--contracted & {
    display: inline-block;
  }
}

.sidebar__icons {
  display: flex;
  align-items: center;
  position: relative;
}

.sidebar__folder-icon {
  margin-right: #{5 / $base-font-size}rem;
  & g {
    fill: $light-primary-text-color;
  }
}

.sidebar__file-item-icon {
  margin-right: #{5 / $base-font-size}rem;
}

.sidebar__project-options {
  @extend %modal;
  display: none;
  position: absolute;
  .sidebar--project-options & {
    display: block;
  }
  top: 100%;
  padding: #{8 / $base-font-size}rem;
  width: #{110 / $base-font-size}rem;
}

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