This is not incorrect but....
Bootstrap 4 comes with a file in includes/templates/YOUR_TEMPLATE/css/dist-site_specific_styles.php. Making your changes to this file and saving it as includes/templates/YOUR_TEMPLATE/css/site_specific_styles.php is the recommended way to keep all your changes together for when you need them.
@Angiex1 - in your case, YOUR_TEMPLATE is bootstrap. I would also recommend that you use lat9's clone a template to clone the bootstrap to something else you like. This will keep the original bootstrap "clean" and able to be used in troubleshooting.
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