Hi Community

I need to add the following piece of code (it will stop a zoom effect when button is clicked in mobile view):

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

to a site I'm building which has a booking panel. 

I've tried adding to the html head and also the 'Header Code' section within the SEO settings, but neither seems to work. Has anyone got any suggestions?

Many thanks

Simon