This project was bootstrapped with;
After you run npm i, you can start the project with npm start. It runs on http://localhost:3010.
Themes are under src/semantic-ui folder.
theme.config file manages what theme to load.
Initially it is loading default themes, with styles overriden by variables under mysite folder.
You can check semantic-ui's default style variables under src/semantic-ui/themes/default folder. This folder is read only, please do not make any updates to the themes folder and files it contains.
Let's say you want to change the button styles. Look for the default button variables under src/semantic-ui/themes/default/elements/button.variables to see what values you can change in your mysite folder. Then go to src/semantic-ui/mysite/elements/buttons.variables file (You can add .less extension to that file's name for code highlighting if it is not already done). Then you can give new values to the variables in that file under the mysite folder.