Hugo allows you to edit statics when you use a theme. So, you can overwrite any file.
We suggest to replace these statics; /static/logo.png, /static/background.jpeg, /static/CNAME, /static/favicon.ico.
You just need to create related file(s) inside your project. They should be in same path.
Do not edit the theme directly, otherwise it may break your upgrade in future.
Create /static/css/colors.css in your repo to be able to change colors used in the theme.
Create /static/css/width.css in your repo to be able to change width value.
Create /layouts/partials/fonts.html in your repo to be able to change fonts.
Create /static/css/custom.css in your repo to be able to add or override CSS directives.