.CodeMirror-foldmarker {
    background: #585a65;
    padding: 0px 3px;
    color: #e0e0e0;
    border-radius: 2px;
    font-family: arial;
    line-height: .3;
    cursor: pointer;
  }
  .CodeMirror-foldgutter {
    width: .7em;
  }
  .CodeMirror-foldgutter-open,
  .CodeMirror-foldgutter-folded {
    cursor: pointer;
  }
  .CodeMirror-foldgutter-open:after {
    content: "\25BE";
  }
  .CodeMirror-foldgutter-folded:after {
    content: "\25B8";
  }