On dialog tab or expansion - the chinese uses a large bold font which is easy to ready on a laptop
On the vocab tab - the chinese uses a slighty smaller font which still easy to read.
In the exercises tab, the chinese uses a font which is small, not bold and hard to read, and I find that I need to zoom the web page to 175% to get similar clarity as the vocab page.
Could you please increase the chinese font so it uses the same size font (bold) etc as used in the vocab tab. This will also make your website look more consistent.
As a side issue, if you zoom the webpage (of the exercise tab) after doing any of the word matches, you will find that the lines drawn between matching words appear in the wrong places.