Thank you for this question. I also needed to fit a long consent form on the first page of my survey and did not want to scare participants away. Now it looks like more like a user agreement that people are used to seeing. The code I ended up using combined the comments in this informative thread. Not sure if any of it is redundant but it seems to be working so far.
<div style="max-width:100%;width:100%;height:50vh;overflow:auto;border:8px solid yellowgreen;padding:2%"> YOUR TEXT HERE</div>
Cheers
Sorry, Qubie here. The code is:
< div style="max-width:100%;width:100%;height:50vh;overflow:auto;border:8px solid yellowgreen;padding:2%">YOUR TEXT HERE< /div>
Just remove the space after <