How to get the style.css file?

Appearance–> Editor–> style.css

My style.css shows only:

/*
Theme Name: Pixova Lite
Theme URI: https://www.machothemes.com/themes/pixova-lite/
Author: Macho Themes
Author URI: https://www.machothemes.com/
Description: …
Tags: some tags…
Text Domain: pixova-lite

This theme, like WordPress, is licensed under the GPL.
*/

@import url(‘layout/css/style.min.css’);

How to get the actual root for the style.css file cause i want to change the size of the header…?

Is there anyway to do that?