The OpenLearn Create site was created by the OU who are world leaders in online learning, so they have tried to support as many devices as possible. You should be able to use most post-2010 desktops and laptops easily enough, providing your browser is relatively new and updated regularly. Tablets and smartphones will vary considerably - iPads (including mini) seem to work well but some tablets, particularly old Android devices and Amazon Fire tablets, might have display problems.

Try running the browser full screen or adjust the text size  on devices that permit this but the best advice would be to try another device if you can.