Bootstrap 5 sizes in Bootstrap 4

_variables.scss

$grid-columns: 12;
$grid-gutter-width: 24px;

$grid-breakpoints: (
    xs: 0,
    sm: 576px,
    md: 768px,
    lg: 992px,
    xl: 1200px,
    xxl: 1400px
) !default;

$container-max-widths: (
    sm: 540px,
    md: 720px,
    lg: 960px,
    xl: 1140px,
    xxl: 1320px
) !default;