html - How to deal with dark mode on the eBay iOS app?

The eBay app for iOS is destroying my item listing page’s stylesheet when the device is in dark mode, turning it into a disgusting pink mess!

To be clear: when listing an item, it accepts HTML & CSS in the description

Here is how my eBay listing displays on the app during daylight hours:

Here is how it looks if dark mode is enabled in the iPhone's Settings app (or if using a schedule to switch it on at night time):

(click to enlarge images)

It has changed the colours of:

Things I have tried:

Added <meta name="color-scheme" content="only light"> inside <head>...</head>
- eBay strips the <head> tag but keeps the <meta> tag
Added :root, * { color-scheme: only light !important; } inside my .css file
Changed my CSS rules to !important
Set html, body { background-color: #ffffff !important; }
Set html, body { background-color: #000000 !important; background-image: linear-gradient(#ffffff, #ffffff) !important; }
I noticed that eBay wraps my entire description in a <div class="x-item-description-child"> so I tried resetting all properties with .x-item-description-child { all: initial }
Changed the link to my .css file to use ?v=12345, to force a cache-bust

These changes fix Safari but have zero effect on the eBay app.

Which browser is the eBay app using under the hood?
- How can we check?
- I heard that all web browser controls in iOS apps really just use Safari?
- Are they using the wkwebview control?
- Can eBay use this control be used to inject forced styles? It seems to be possible
- If so, how can these be overridden by the page being displayed by the control - I.E. me?
How can I force the eBay app to respect the colours I have chosen?
- eBay prevents the use of JavaScript
Alternatively, how can I set my own dark theme in the CSS?
- The usual method of @media (prefers-color-scheme: dark) { .someElement { background: black } } appears to have no effect
Does this behaviour also affect their Android app?

Amongst many others:

科技改变生活-雨落星辰 - 所有的伟大,都源于一个勇敢的开始