Google Search Console showing errors

Hello! Can you help fix the errors below?

External style sheets are not supported, except for supported font providers. Use the "style amp-custom" tag inline of the document.

A required AMP HTML tag is missing from the document.

There is a CSS syntax error in the "style amp-custom" tag.

The "style amp-custom" tag text contains "html comments", which is not allowed.

There is an AMP component "script" tag that is not used.