<p class="a-perex">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Curabitur bibendum justo non orci. Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</p>

.a-perex {

    @include font-size(medium);
    line-height: line-height(normal);
    margin-left: auto;
    margin-right: auto;
    max-width: map-get($container-max-widths, 'md');
    text-align: center;

}