My own blogs are responsive and so they display well on multiple device types.
Students tell me they like the theme (The Suits Theme) on my class blog; they say it looks professional.
However my e-learning course is less responsive. There is a mobile interface which becomes active when you use mobile device, but there are a couple of components on my course homepage which only appear using the desktop interface (custom widgets with links to the Padlet and the YouTube playlist for the course). Some course tools aren’t available in this view (e.g. the Checklist Tool).
What’s more, I have created quite a few PDF files for the programming concepts in the course. These files, because they are paginated, are not responsive.
Honestly, I don’t remember considering that issue when finally deciding to use PDFs. Since students are coding on computers anyway perhaps it doesn’t matter that much. And other stuff, like news and discussions, are mobile-friendly.
But I’ve unintentionally made it difficult for them to use small, mobile devices to keep up with the “text” part of the course (i.e. when they’re not actively programming). I do have a lot of video on there, which is (I think) fairly accessible.
I’ll have to think about whether it’s worth fixing the responsiveness of those PDFs.