I have a intel i7 7800 cup CPU and when I YouTube or website browse, sometimes cup CPU temperature go to 65 c, that is fine or safe ?
Cup cooler using Cooler master hyoper 212 led & mother board using Asrock b360 gaming k465C is not unusually high for an under load temp, but, i'd check your browser settings/advanced to see if 'use hardware acceleration when available' is enabled...
what CPU cooler are you using?