Responsive <meta> tag

The <meta> tag is helpful for mobile layouts
Tells the browser that you are opting into building a mobile site
Without this tag, smartphones may try to show a scaled version of desktop sites

<html>
    <head>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        ...
    </head>
    <body>...</body>
</html>

9 / 22