Atom stylesheet (for markdown line breaks)

stylesheet.less

@import (reference) "syntax-variables";
atom-text-editor::shadow {
  .gfm {
    .linebreak:after { // show markdown double-space line break
      font-family: 'Octicons Regular';
      font-weight: normal;
      font-style: normal;
      display: inline-block;
      line-height: 1;
      -webkit-font-smoothing: antialiased;
      text-decoration: none;
      font-size: 1rem;
      width: 1rem;
      height: 1rem;
      content: "\f0a9"; //found no better icon in octicons
      color: @syntax-invisible-character-color;
    }
  }
  .invisible-character { // show invisibles only in selection
      color: @syntax-background-color;
  }
  .line .fold-marker::before {
    content: "";
    border-bottom: 1px dashed @syntax-invisible-character-color;
    position: absolute;
    left: 0;
    width: 100%;
    display: block;
  }
  .line.cursor-line .fold-marker::before {
    border-color: @syntax-text-color;
  }
}