emoji linter in atom

config.less

.linter-row.decoration {
  border-radius: 3px;
  justify-content: center;
  color: darken(@red, 30%);

  .linter-gutter.linter-highlight.error,  .linter-gutter.linter-highlight.warning{

    &:before {
      background-color: darken(@red, 30%) !important;
      position: absolute;
      content: '🔥';
      font-size: 0.9em;
      left: 0;
      top: 0;
      text-align: left;
      padding-left: 2px;
      width: 100%;
    }

    background: transparent;
  }

  .linter-gutter.linter-highlight.warning:before {
    background-color: darken(@orange, 60%) !important;
    content: '💀';
  }
}