VScode插件Markdown Preview Enhanced中可以自定义css，我最喜欢的风格为如下css文件所述：

/* Please visit the URL below for more information: */
/*   https://shd101wyy.github.io/markdown-preview-enhanced/#/customize-css */

.markdown-preview.markdown-preview {
  // modify your style here
  background-color: #2e2e2e;
  color: grey; 

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    color: grey;
  }
}