CCS validation error

Good morning,
I want to validate CCS in  https://jigsaw.w3.org/css-validator/ this
URL http://upred.gov.in/
<https://servicioselectorales.tse.go.cr/PlataformaExterna> but I've
received this error :  "error I/O "Error: Connection reset".
Last week was working well, but right now it's not working. Please ,
let me know If you can help me , I'm really worried about this
situation.
Regards,


|| Bobby Arya ||

HUMANITY Is bIGGer ThaN EveRy ReLiGioN