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HTML 

              
                <main>
  <h1>Fighting the Flying Footer</h1>
  <section>
    <p>Using <strong>CSS Grid</strong> to position the footer at the bottom - allowing for a variable footer height.</p>
    <hr>
    <h2>Join the Fight!</h2>
    <p>Read the blog post:<br> <a href="https://redonion.se/en/fighting-the-flying-footer/" title="Read the blog post">redonion.se</a></p>
  </section>
</main>

<footer>
  <p>I'm the footer. And I'm happy where I am.</p>
</footer>
!

CSS 

              
                /*Layout styles*/
body{
  display:grid;
  grid-template-columns: 1fr;
  grid-template-rows:1fr auto;
  min-height:100vh;
}

//main{
  /*use margin 0 to have the element take up all space down to the footer*/
  /*margin:0 0 auto 0; /*use margin-bottom auto if you don't want the element to cover the length of the body*/  
//}

footer{
  margin:0;
}

//----------------------------------------------
/*Cosmetic styles*/
:root{
    --modular1: 1.125;
    --modular2: 1.414;

    --startwidth: 30;
    --endwidth:105;

    //need these numbers for h6 and p without units for calc.
    --base-min: 1;
    --base-max:1.25;

    --h1-responsive: calc(var(--h1-size) + ((var(--modular2) * var(--modular2) * var(--modular2) * var(--modular2) * var(--modular2)) - (var(--modular1) * var(--modular1) * var(--modular1) * var(--modular1) * var(--modular1))) * ((100vw - (var(--startwidth) * 1em)) / (var(--endwidth) - var(--startwidth))));
  
      --h2-responsive:calc(var(--h2-size) + ((var(--modular2) * var(--modular2)) - (var(--modular1) * var(--modular1))) * ((100vw - (var(--startwidth) * 1em)) / (var(--endwidth) - var(--startwidth))));  
  
    --p-responsive:calc(var(--p-size) + ((var(--base-max)) - (var(--base-min))) * ((100vw - (var(--startwidth) * 1em)) / (var(--endwidth) - var(--startwidth))));

    --h1-size: calc(var(--modular1) * var(--modular1) * var(--modular1) * var(--modular1) * var(--modular1) * 1em);
  
    //--h2-size: calc(var(--modular1) * var(--modular1) * var(--modular1) * var(--modular1) * 1em);
    --h2-size: calc(var(--modular1) * var(--modular1) * 1em);

    --p-size:calc(var(--base-min) * 1em);
}

body{
  background-color:green;
  text-align:center;
  font-family:/*ios*/ "HelveticaNeue", /*android*/ "Roboto", /*fallbacks*/ Arial, Verdana, "Trebuchet MS", sans-serif;
  color:#584d4d;
}

main{
  background-color:#fffaf8;
  padding:3em 1em 0 1em;
  box-sizing:border-box;
}

footer{
  background-color:aliceblue;
  padding:0 1em;
  box-sizing:border-box;
  background-image:linear-gradient(to right, #ff885d 0%,#ff5062 100%);
  color:#FFF;
}

h1{
  font-family: 'Great Vibes', Arial, Helvetica, sans-serif;
  background-image:linear-gradient(to right, #ff885d 0%,#ff5062 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: rgba(0, 0, 0, 0);  
  color:#2f2f2f;
  font-size: var(--h1-size);
  line-height: 1.45669;//42px;
  margin:(12/28.8325)+em 0;
}

h2{
   font-size: var(--h2-size);
   line-height: 1.629629629629; //33
   margin:(9/20.25)+em 0;
   letter-spacing: 3px;
   text-transform: uppercase;
}

p{ 
  line-height:1.5;
  margin: 0.75em auto;
  font-size:var(--p-size);
}

a{
  color: #FFF;
  background-image:linear-gradient(to right, #ff7644 0%, #f94456 100%);
  text-decoration:none;
  padding:0 0.25em;
  opacity:0.85;
  transition:0.5s opacity;
  display:inline-block;
  margin:0.5em auto 0;
  
  &:hover, &:focus, &:active{
    opacity:1;
  }
}

hr{
  width:5em;
  margin:3em auto;
}

@media only screen and (min-width: 30em) {
  h1, h2{
    //expression for responsive margins
    --margin-responsive: calc((var(--margin-min, 1) * 1rem) + (var(--margin-max, 1.125) - var(--margin-min, 1)) * ((100vw - (var(--startwidth) * 1rem)) / (var(--endwidth) - var(--startwidth))));
    margin:var(--margin-responsive) auto;

    //expression for responsive line-heights
    --lineheight-responsive:calc((var(--lineheight-min) * 1rem) + (var(--lineheight-max) - var(--lineheight-min)) * ((100vw - (var(--startwidth) * 1rem)) / (var(--endwidth) - var(--startwidth))));
    line-height: var(--lineheight-responsive);
  }

  h1{
    --margin-min:0.75; //12
    --margin-max: 1.875; //30;
    --lineheight-min:2.625; //42
    --lineheight-max:7.03125;//112.5
    font-size:var(--h1-responsive);
  }
  
  h2{
    font-size:var(--h2-responsive);
    --margin-min:0.5625;//9
    --margin-max:0.9375;// 15
    --lineheight-min: 2.0625;//33px
    --lineheight-max: 3.28125;//52.5
  }
  
  p{
    font-size: var(--p-responsive);
  }
}

@media only screen and (min-width: 105em) {
  :root{
    //changing scales and base
    --modular1: var(--modular2);
    --base-min: var(--base-max);
  }
  
  h1{
    font-size: var(--h1-size);
    line-height: (112.5/90.4413);
    margin: 0.331706864em auto;//30px
  }
  
  h2{
    font-size: var(--h2-size);
    line-height:(52.5/31.9903);
    margin:(15/31.9903)+em auto;
  }
  
  p{
    font-size: var(--p-size);
  }
}
!

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