My child style.css file isn't allowing any changes to styling using the bootstrap parent template I downloaded from here

I’ve created a child theme locally using the downloaded wordpress to bootstrap theme ‘wp12.3-3.5-bootstrap-to-wp’ from the lesson ‘From Bootstrap to Wordpress Outro’.

Non of the styles I have attempted to override in style.css update anything.

I have updated .php files and they update perfectly just not the style.cc file.

I have also tried changing what parent template the style.css point to and all works fine with other theme just not the bootstrap version.

When I edit the original ’bootstrap-to-wp’ style.css file I can change anything. I’m assuming that for some reason the ’bootstrap-to-wp’ isn’t allowing anything to override it.

I’m working locally on Mac with MAMP using Dreamweaver CC to edit files.

This is all I have in the style.css child theme:

/*  Theme Name: bootstrap-to-wp child Theme 
    Description: A demo child theme for the bootstrap-to-wp 
    Author: bootstrap-to-wp 
    Version: 1.0 
    Template: bootstrap-to-wp
*/

@import url('../bootstrap-to-wp/style.css');

h1, h2, h3 {
    color: rgba(1,51,163,1.00);
}

Any pointers? Thanks in advance