My school is rough

The edge is made from zero on the Pixel Perfect model.
the crossbrowser,
the valid code,
by BEM.
The speed of Google 97/100
https://developers.google.com/speed/pagespeed/insights/?hl=RU&url=http%3A%2F%2Fverstca.hostronavt.ru%2F%3Fi%3D1&tab=desktop