Problem: This website can be rendered only by picobrowser, go and catch the flag! https://2019shell1.picoctf.com/problem/21851/ (link) or http://2019shell1.picoctf.com:21851
Solution: Change the user agent of your browser and then hit the button to get the flag.
Flag: picoCTF{p1c0_s3cr3t_ag3nt_3e1c0ea2}