Can not create new breakpoints in bootstrap 4 using CDN

[kizoso]

I use BootstrapCDN. Other styles written in sass and built by gulp. I need to create my own breakpionts. Is it possible to make them if I use CDN? For example, I want to create these breakpoints:

--breakpoint-xxxs: 0;
--breakpoint-xxs: 320px;
--breakpoint-xs: 568px;
--breakpoint-sm: 667px;
--breakpoint-md: 768px;
--breakpoint-lg: 992px;
--breakpoint-xl: 1200px;
--breakpoint-xxl: 1440px;
--breakpoint-xxxl: 1600px;

I want to get something like this with working media:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<div class="container">
	<div class="row">
		<div class="col col-xxxs-1 col-xxs-2 col-xs-3 col-sm-4 col-md-5 col-lg-6 col-xl-7 col-xxl-8 col-xxxl-9">
			<div style="height:100vh;background:purple">text</div>
		</div><!--col-->
	</div><!--.row-->
</div><!--.container-->

I found the manual and I'm trying this:

$grid-breakpoints: (xxxs: 0, xxs: 320px, xs: 568px, sm: 667px, md: 768px, lg: 992px, xl: 1200px, xxl: 1440px, xxxl: 1600px)!default

$container-max-widths: (xxxs: 0, xxs: 320px, xs: 568px, sm: 667px, md: 768px, lg: 992px, xl: 1200px, xxl: 1440px, xxxl: 1600px)!default

\:root
  --breakpoint-xxxs: 0
  --breakpoint-xxs: 320px
  --breakpoint-xs: 568px
  --breakpoint-sm: 667px
  --breakpoint-md: 768px
  --breakpoint-lg: 992px
  --breakpoint-xl: 1200px
  --breakpoint-xxl: 1440px
  --breakpoint-xxxl: 1600px

But it doesn't work. What I'm doing wrong?
If that is not possible... Is there any alternative? Can I easily edit my code to simulate bootstrap grid with my breakpoints?
Thank you in advance for your help.

[browner12]

The CDN is providing you compiled css, not the source SASS. Therefore, you cannot use the SASS variables to add extra breakpoints.

If you would like to create custom code, download BS4 from Yarn/NPM/etc

[mdo]

Yup, what @browner12 said. You're mixing CSS variables with Sass variables; if you want to customize Bootstrap's source code, you'll need to compile the Sass.

[kizoso]

@browner12 @mdo Thank you, but I found the solution.