Hello my site is https://tradrco.com/
While adding some final touches to my website I couldn't help but notice that pages that give a 404 show a not so good 404 page.. I used Shopify before and they allow you the change the wording and stuff on a 404 page within the code, but unfortunately I can't seem to find how to do that here...
For example if you take a look at: https://www.tradrco.com/randompage
It will send you to an ugly blue-themed 404 page... It doesn't match my theme at all.
Any help will be greatly appreciated.