Rapid Flickering of Some Tumblr Embeds

Making an issue for what was brought up in the server. The tumblr embed on the side of some posts, like this one, can flicker rapidly (such as in Firefox ESR 115.13.0). Some notes about what I tried to fix it below:

changing the length of the name makes it stop breaking, but everything else still flickers, probably something about width
probably a symptom, the overflow of <body id="tumblr" class="palette--trueBlue"> is flickering on and off
adding box-sizing border-box to the following inside, in <div id="base-container">, can fix it:
```
.xN3lM {
box-sizing: border-box;
}
```
adding even 1 px of padding to the iframe stops it
adding 4px of padding to .ql-editor also fixes it
probably something to do with max width?

BobaBoard / boba-frontend

Rapid Flickering of Some Tumblr Embeds #154