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HTML

              
                <main class="cards">
  <section class="card">
    <h2>Lorem Egestas Tristique Ligula</h2>
    <p>Donec id elit non mi porta gravida at eget metus. Maecenas faucibus mollis interdum. Nullam quis risus eget urna mollis ornare vel eu leo.</p>
  </section>
  <section class="card">
    <h2>Cras Fermentum Bibendum Dolor</h2>
    <p>Cras justo odio, dapibus ac facilisis in, egestas eget quam. Nullam quis risus eget urna mollis ornare vel eu leo.</p>
  </section>
  <section class="card">
    <h2>Pharetra Mattis Tristique Mollis Quam</h2>
    <p>Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
  </section>
  <section class="card">
    <h2>Nullam Aenean</h2>
    <p>Vestibulum id ligula porta felis euismod semper. Nullam quis risus eget urna mollis ornare vel eu leo.</p>
  </section>
  <section class="card">
    <h2>Porta Venenatis Sollicitudin Pharetra</h2>
    <p>Nullam quis risus eget urna mollis ornare vel eu leo. Sed posuere consectetur est at lobortis.</p>
  </section>
  <section class="card">
    <h2>Fermentum Lorem Parturient Dapibus</h2>
    <p>Donec ullamcorper nulla non metus auctor fringilla. Aenean lacinia bibendum nulla sed consectetur.</p>
  </section>
</main>
              
            
!

CSS

              
                /* Sizes that the rest of our system will be based on */
$ft-screen-width: 1440;
$ft-body: 20;
$ft-body-min: 0.75rem; /* Going this small for demo purposes */
$ft-body-max: 2rem;
$ft-body-vw: $ft-body / $ft-screen-width * 100vw;

/* All of the other sizes we want. The key can be any
   string, and the value should be in pixels without
   the unit */
$ft-sizes: (
  heading: 26,
  small: 12
);

/* Mixin to generate the the fluid sizes as
   custom properties */
@mixin sizeVar($name, $size, $min: false, $max: false) {
  $proportion: $size / $ft-body;
  @if not $min {
    $min: $ft-body-min * $proportion;
  }   
  @if not $max {
    $max: $ft-body-max * $proportion;
  }
  $vw: $ft-body-vw * $proportion;
  --ft-size-#{$name}: clamp(#{$min}, #{$vw}, #{$max});
}

/* Style mixins to more easily manage font styles */
@mixin style-body() {
  --space-1rem: 1em;
  font-family: Georgia, serif;
  font-size: var(--ft-size-body);
  font-style: normal;
  font-weight: 400;
  line-height: 1.5;
  text-transform: none;
  word-spacing: normal;
}

@mixin style-heading() {
  --space-1rem: 0.77em;
  font-family: sans-serif;
  font-size: var(--ft-size-heading);
  font-style: normal;
  font-weight: 400;
  line-height: 1.25;
  text-transform: uppercase;
  word-spacing: 0.15em;
}

/* Declare the body font size custom property, then use the
   mixin to generate all of the other custom properties */
:root {
  --ft-size-body: clamp(#{$ft-body-min}, #{$ft-body-vw}, #{$ft-body-max});
  @each $name, $size in $ft-sizes {
    @include sizeVar($name, $size);
  }
}

body {
  @include style-body;
  padding: 1em;
}

h2 {
  @include style-heading;
  margin-bottom: calc(var(--space-1rem) - 0.25em); // Shave a little bit off of this; there is a difference between exact numerical spacing and better optical spacing
  margin-top: 0;
}

p {
  margin-bottom: var(--space-1rem);
  margin-top: 0;
  &:last-child {
    margin-bottom: 0;
  }
}

.cards {
  column-gap: 1em;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  row-gap: 1em;
}

.card {
  border: 1px solid black;
  padding: 1em;
}
              
            
!

JS

              
                
              
            
!
999px

Console