Cross-browser, adaptive and reliable layer

Cross-browser, adaptive, and reliable bandwidth, made with a clean code, without a bootstrap.
This wrap was done by me when I pulled out the wrap skills. He tried to make this line “unmortal”,
No errors in the W3C validator, and with fast download speed, both on the desktop and in the mobile version.
You can check the link at: https://dmytroupwork.github.io/Business-card-website/
You can try to break this layer) if you can).