sticky header for responsive (smartphone) view

[koaning (Vincent D Warmerdam)]

I wrote a small tutorial on making text blocks scrollable here:

Is it possbile to freeze the text-input interface while scrolling through the text data?

Hello there! I am writing summaries for some (long) text data in a text-input interface. I wonder if there is a way to freeze the text-input interface/box which I put above the text data, so that when I scroll through the text data, especially for long ones, I can still look at my current summary, in a way similar to the frozen blue banner of entity names in the NER interface? Thank you!

Would that help in your situation?