Something like that:
https://jungle.chintai.io/rex
Or that:
https://blockstream.com/satellite/
Check out the links in this post as well: https://dev.to/nzonnenberg/basic-color-theory-for-web-developers-15a0

Make sure, that the list is sorted according to market cap.

• Create proper arrow png with transparent background (or even better: svg) and optimize positioning
• Only show 2-letter language code. But once select list is opened show full language name. Like on SKD Dresden
• Clean-up CSS
• Describe how to translate app in /data/readme.md

Example: If value "-1.5 %" can be found twice in the portfolio the app will crash due to an infinite loop.

On mobile it doesn't work at all. Many things to improve on desktop:

• Arrow up/down to select coin
• Error message, if nothing has been found
• If one clicks on dropdown list selection bar the list closes. To be fixed
• Selection with Laptop touchpad does not work (list closes). To be fixed
• Add arrow symbols with CSS so it gets clearer, that something can be selected here

When replacing the hash with a new one the old value is still used to withdraw portfolio information. Problem only appears if the variable "hash" has been assigned, thus no problem when entering a hash after loading the main page. When opening a new tab it also works without a problem.

It sorts according to absolute value - not taking +/- into account.

Some Azure problem apparently...
"Error: Failed to start language worker process for: node. node exited with code -1"
Azure/azure-functions-host#3614

Cold start time of Azure functions is unfortunately still quite high (around 10s). Due to this users could be tempted to click multiple times on the save button. This should be avoided, since many portfolios are going to be created.

Solution:
After click on Save grey out and deactivate button.

If web storage is !empty, load from web storage then query db anyway and update display, if version from db is different from the one in Web storage.

In that way the 10sec cold start time of Azure Functions doesn't impact the user experience so much.

Maybe like this: https://www.devcurry.com/2009/04/using-javascript-to-dropdown-html.html

Make sure that last entry cannot be deleted

On Chrome for Windows. All fine on Edge and Chrome for Android.