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Your page isn't configured correctly for mobile devices. It may appear zoomed out, broken, or cut off on phones and tablets — which is where the majority of today's web traffic comes from.
On WordPress
This tag is included in all modern WordPress themes. If it's missing, your theme is outdated — consider upgrading to a current theme. You can also add it manually to your theme's header.php file.
On Shopify
All Shopify themes include the viewport tag. If this issue appears, check for a custom theme modification that may have removed it from the theme.liquid file.
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