The recommended method to include the above CSS media queries is to put it into a dedicated CSS file and import it into each of your HTML page.

Put the below CSS content into a file called `devices.css`.

    @media screen and (max-width: 600px) {
        body {
            font-size: 14px;
        }
        .container {
            display: flex;
            flex-wrap: wrap;
        }
        .item {
            width: 50%;
        }
    }

Then, inside the `<head>` element of your HTML file, add the following line:

    <link rel="stylesheet" href="devices.css">

You can change the name of `devices.css` to other names, but you must change the `link href` part accordingly.
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