Changing background of Shopify section - ID's reliable?

I’m trying to change the background colour of a section generated by an app, but it seems the only way to do it is via the section’s ID, ie:

#shopify-section-template--18331524890870__1723807728af0eaf1c {
    background-color: gray;
}

However I believe I have read these generated ID’s are not completely reliable and subject to change?

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Hello @Cyphix333
Our team is ready to help you.
Please share your website address and access password (if necessary) so that we can check and assist you.

Huh? It is not a live site, and why would I share my password with you?

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I just need the address to your website to check. Some websites require a password to access, if your website does not require a password to access then you do not need one.

And if you use ID for css then this is only true at the time that ID still exists, if you change them then the ID will be changed and at that time your css will no longer work and must be updated according to the new ID @Cyphix333 .