CSS Nested Lists

  
<ol style="list-style-type: decimal;">
       <li>aaa
              <ol style="list-style-type: lower-alpha;">
                     <li>aaa</li>
                     <li>bbb
                           <ol style="list-style-type: lower-roman;">
                                  <li>aaa</li>
                                  <li>bbb</li>
                                  <li>ccc</li>
                           </ol>
                     </li>
                     <li>ccc</li>
              </ol>
       </li>
       <li>bbb</li>
       <li>ccc</li>
</ol>

1. aaa
   1. aaa
   2. bbb
      1. aaa
      2. bbb
      3. ccc
   3. ccc
2. bbb
3. ccc