//$row-width: rem-calc(1000);

$row-width: rem-calc(1920);

$large-breakpoint:  em-calc(1440);
$xlarge-breakpoint: em-calc(1920);

$include-xl-html-grid-classes: true;
$include-xl-html-block-grid-classes: true;

<div class="row">
<div class="xlarge-12 columns">content</div>
</div>

<div class="row">
    <div class="large-10 xlarge-12 columns">content</div>
</div>