The creator of the site has already updated the colors in response to the feedback. If you still don't see it, there is a handy Daltonization add-on that might help with sites like this:
I used to use it myself until I got my colorlite glasses (although it still is practical to show to others how a website might be unreadable for me without the glasses)
https://addons.mozilla.org/en-US/firefox/addon/let-s-get-col...
https://chrome.google.com/webstore/detail/lets-get-color-bli...
I used to use it myself until I got my colorlite glasses (although it still is practical to show to others how a website might be unreadable for me without the glasses)