/// When set to true, it sets the box-sizing property of all elements to `border-box`. Set with a `!global` flag.
///
/// @type Bool
///
/// @example css - CSS Output
///   html {
///     box-sizing: border-box; }
///
///   *, *::after, *::before {
///     box-sizing: inherit;
///   }
$border-box-sizing: false;