13. list numbering

Suppose we have some lists, they could be simple as

<ol>  <li>BFE.dev</li>  <li>JavaScript</li>  <li>CSS</li>  <li>System Design</li></ol>

or nested.

<ol>  <li>BFE.dev</li>  <li>    JavaScript    <ol>      <li>TypeScript</li>      <li>Quiz</li>      <li>        Framework        <ol>          <li>React</li>          <li>Vue.js</li>        </ol>      </li>    </ol>  </li>  <li>CSS</li>  <li>System Design</li></ol>

please number the list as below, with color #f44336 and one space between the number and content.