//
// Button
//
// @param  hash  params  properties for decoration
//
// .c-btn {
//   _btn({
//     background-color: null,
//     border: null,
//     padding: _space(.5) _space(1),
//   });
// }
//
// <a class="c-btn" role="button">btn</a>
//

_btn(params = {}) {
  params = merge(
    {
      background-color: null,
      border: null,
      padding: _space(.5) _space(1),
    },
    params
  );

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

  display: inline-block;
  cursor: pointer;
  line-height: 1;
  overflow: hidden;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  white-space: nowrap;

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

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

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