I noticed recently that I cannot close the subscription overlay once open unless I zoom the browser out to 90% or click at the very bottom of the page, pretty sure it was working so something has changed. I am using Ghost version: 3.4.0 with the Casper theme.
I have tried installing and activating a clean instance of Casper theme, restarted Ghost, cleared Yarn cache, tried different browsers. Still does it. Any ideas would really be appreciated.