When I run my app outside ShinyProxy it appears as expected without the white line depicted below (hard to see until the image is downloaded and viewed against a black background). I am using ShinyProxy 2.4.3 running inside a Docker container. The issue is not browser specific; I tried running it on Safari and Chrome and the issue persists.
Okay, it turned out to be an easy fix that I overlooked.
I changed this line in the app.html
file:
<body style="padding: 1px;">
To this:
<body style="padding: 0px;">
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