It's not a magic trick, I'm just using Firefox with the add-on called Dark Mode. All websites background are modified and this is the result on our loved Upwork
I remember I've read some posts about the difficulties on reading for someone in here, and I hope this solution may help them too.
**edited for Community Guidelines**
Solved! Go to Solution.
Another forum page linked me here.
If you're a chrome user, you can download and install extensions which can switch the page to dark mode.
Use it all the time when browsing the web at night