//
// Generate balloon
//
// @param  string  angle   position of arrow
// @param  hash    params  properties for decoration
//
_balloon(angle, params = {}) {
  params = merge(
    {
      background-color: null,
      border-color: null,
      border-size: null,
      triangle-size: 10px,
      padding: _space(.75),
    },
    params
  );

  background-color = params['background-color'];
  border-color = params['border-color'];
  border-size = params['border-size'];
  triangle-size = params['triangle-size'];
  padding = params['padding'];

  position: relative;

  if (! _is-null(border-size)) {
    background-color: background-color;
  }

  if (! _is-null(border-size) && ! _is-null(border-color)) {
    border: border-size solid border-color;
  }

  if (! _is-null(padding)) {
    padding: padding;
  }

  _balloon-triangle(
    angle,
    triangle-size,
    background-color,
    border-size,
    border-color
  );
}