html - CSS :first-child pseudo-element -

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why code not working intended? background-color of first article must green. how can without classes or id? p.s. i'm sorry post needs more text. i'm sorry post needs more text.

    <!doctype html> <html>     <head>           <meta charset="utf-8">         <title>stack</title>          <link rel="stylesheet" href="css/style_new.css">     </head>      <body>          <section>             <h1>this h1 header</h1>              <article>                 <p>                     lorem ipsum dolor sit amet lorem ipsum dolor sit amet lorem ipsum dolor sit amet                     lorem ipsum dolor sit amet lorem ipsum dolor sit                   </p>             </article>              <article>                 <p>                     lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod                      tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam,                   </p>             </article>              <article>                 <p>                     lorem ipsum dolor sit amet, consectetur adipisicing elit, sed eiusmod                      tempor incididunt ut labore et dolore magna aliqua. ut enim ad minim veniam,                   </p>             </article>         </section>     </body>  </html>

css code:

     section article:first-child {     background-color: green; }      section article:last-child {         background-color: red;     }

actually first child of section tag h1 not article. use below code instead,

section article:first-of-type {   background-color: green; }

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