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Media queries in css being ignored

Trying to implement simple media query for practice on notepad, but it doesn't seem to be picking up and I don't know why.

<!DOCTYPE HTML>
<style>

.heading {

    margin-left: 220px;
}

@media screen and (max-width: 479px) {
  
  .heading {
    margin-left: 30px;
    }
    
   }
</style>

<h1 class="heading">Hello World</h1>
</html>

When I run this in the chrome browser in iPhone view, it ignores the media query and applies the first margin-left instead.

Set your viewport with:

<meta name="viewport" content="width=device-width, initial-scale=1.0">

 .heading { margin-left: 220px; } @media screen and (max-width: 479px) {.heading { margin-left: 30px; } }
 <meta name="viewport" content="width=device-width, initial-scale=1.0"> <h1 class="heading">Hello World</h1>

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