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                <p class="rhythm-m">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque gravida eget massa a tincidunt. Morbi interdum elit at sapien vestibulum sodales.</p>
<p class="rhythm-s">Morbi efficitur et ipsum sit amet ullamcorper.</p>
<p class="rhythm-m">Curabitur vel est eget sapien scelerisque efficitur a sit amet risus. Sed scelerisque tortor mi, vel venenatis odio tempor eu. Vestibulum a aliquet nibh.</p>
<p class="rhythm-s">Phasellus mattis vulputate felis, eget porta lectus maximus ac. Proin sed mi vitae diam tempus pharetra.</p>


                // See

 * Config

$line-height: 24px;

$font-sizes:  (s: 13px, m: 15px, l: 19px, xl: 27px);
$cap-heights: (s: 0.8,  m: 0.8,  l: 0.68, xl: 0.68);

// Accepts `s`, `m`, `l`, or `xl`
@function rhythm-shift($size-name) {
  $font-size: map-get($font-sizes, $size-name);
  $cap-height: map-get($cap-heights, $size-name);

  $offset: ($line-height - $cap-height * $font-size) / 2;
  @return round($offset);

 * Solution 2

$offset-s: rhythm-shift(s);
$offset-m: rhythm-shift(m);

.rhythm-s {
  font-size: map-get($font-sizes, s);
  padding-top: $offset-s;
  margin-bottom: -1 * $offset-s;

.rhythm-m {
  font-size: map-get($font-sizes, m);
  padding-top: $offset-m;
  margin-bottom: -1 * $offset-m;

 * Meta

html {
  $grid-color: rgba(red, 0.15);
  background: linear-gradient($grid-color, $grid-color 1px, transparent 1px);
  background-size: 1px $line-height;

body {
  max-width: 400px;
  margin: 0 auto;
  padding: (2 * $line-height) $line-height;
  font-family: system, -apple-system, ".SFNSText-Regular", "San Francisco", "Roboto", "Segoe UI", "Helvetica Neue", "Lucida Grande", sans-serif;
  line-height: $line-height;