message: doc: added examples and documentation for Scrollbars
diff: use crate::*;
  +/// Style an element with scrollbars.
  #[derive(Default)]
  pub struct Scrollbars<'a> {
  static_css_props: StaticCSSProps<'a>,
  }
  impl<'a> Scrollbars<'a> {
  + /// Add horizontal and vertical scrollbars if needed.
  + /// # Example
  + /// ```no_run
  + /// use zoon::*;
  + ///
  + /// let paragraph = Paragraph::new()
  + /// .content(
  + /// "Lorem ipsum dolor sit amet,
  + /// consectetur adipiscing elit. Donec placerat lacus in commodo molestie.",
  + /// )
  + /// .s(Scrollbars::both())
  + /// .s(Height::new(100))
  + /// .s(Width::new(50));
  + /// ```
  pub fn both() -> Self {
  let mut this = Self::default();
  this.static_css_props.insert("overflow", "auto");
  this
  }
  - /// https://css-tricks.com/popping-hidden-overflow/
  + /// Add only the horizontal scrollbar.
  + /// More information available at <https://css-tricks.com/popping-hidden-overflow/>
  + /// # Example
  + /// ```no_run
  + /// use zoon::*;
  + ///
  + /// let paragraph = Paragraph::new()
  + /// .content(
  + /// "Lorem ipsum dolor sit amet,
  + /// consectetur adipiscing elit. Donec placerat lacus in commodo molestie.",
  + /// )
  + /// .s(Scrollbars::x_and_clip_y())
  + /// .s(Height::new(100))
  + /// .s(Width::new(50));
  + /// ```
  pub fn x_and_clip_y() -> Self {
  let mut this = Self::default();
  this.static_css_props.insert("overflow-x", "auto");
  this.static_css_props.insert("overflow-y", "hidden");
  this
  }
  -
  - /// https://css-tricks.com/popping-hidden-overflow/
  + /// Add only the vertical scrollbar.
  + /// More information available at <https://css-tricks.com/popping-hidden-overflow/>
  + /// # Example
  + /// ```no_run
  + /// use zoon::*;
  + ///
  + /// let paragraph = Paragraph::new()
  + /// .content(
  + /// "Lorem ipsum dolor sit amet,
  + /// consectetur adipiscing elit. Donec placerat lacus in commodo molestie.",
  + /// )
  + /// .s(Scrollbars::y_and_clip_x())
  + /// .s(Height::new(100))
  + /// .s(Width::new(50));
  + /// ```
  pub fn y_and_clip_x() -> Self {
  let mut this = Self::default();
  this.static_css_props.insert("overflow-y", "auto");
  