After 20 years of being an amazing online resource, the Sanseido online dictionary is no more. If you try to use the page you get redirected here.
This dictionary was amazing due to it being concise and sooo easy to digest for people wanting to make the monolingual shift. This is a pretty big blow to lots of people that are learning Japanese. Of course there are other sources out there, but imo this was the best.
If you still want to use the dictionary on PC (for making anki cards etc), the workaround I have come up with atm is to use Bluestacks. Bluestacks in an android emulator for PC that will let you download the Sanseido app (from where the concise dictionary is still available).
The site mentions that they have future plans, but nothing at this point. RIP Sanseido.