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HTML

CSS

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HTML

              
                <div class="container container--spaced">
  <label>Using relative Pixel values</label>
  <div class="test">
    <div class="imagebox">image</div>
    <h1>Lorem ipsum dolor sit amet, consectetur adipisici elit.</h1>

    <p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna
      aliqua. Nec dubitamus multa iter quae et nos invenerat. Idque Caesaris facere voluntate liceret: sese habere.
      Inmensae subtilitatis, obscuris et malesuada fames. Morbi odio eros, volutpat ut pharetra vitae, lobortis sed
      nibh.</p>
  </div>
</div>

<div class="container container--centered">
  <span class="help">Change your browser's default font size in the settings to see a difference here.</span>
</div>
<hr>

<div class="container container--spaced">
  <label>Using absolute Pixel values</label>
  <div class="test use-px">
    <div class="imagebox">image</div>
    <h1>Lorem ipsum dolor sit amet, consectetur adipisici elit.</h1>

    <p>Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna
      aliqua. Nec dubitamus multa iter quae et nos invenerat. Idque Caesaris facere voluntate liceret: sese habere.
      Inmensae subtilitatis, obscuris et malesuada fames. Morbi odio eros, volutpat ut pharetra vitae, lobortis sed
      nibh.</p>
  </div>
</div>


              
            
!

CSS

              
                // PX to REM conversion function
@function rem($pixels) {
  // Divide the pixel value by 16 (default font size)
  // Mulitplication by 1rem is needed to set the correct unit for the resulting value
  @return ($pixels / 16) * 1rem;
}

// HTML and Body styling
html {
  // Set 16 px as the base font size, currently the default in all browsers
  // 100% = 1em = 1rem = 16px = 12pt
  font-size: 100%;
  font-family: sans-serif;
}

body {
  // Set the base font size of the body to 16px = 1rem
  font-size: 1rem;
}

// Typo styles
p {
  font-size: rem(18);

  .use-px & {
    // Use a fixed value of 18px for the element
    font-size: 18px;
  }
}

h1 {
  font-size: rem(35);
  margin: rem(10) 0 0;

  .use-px & {
    font-size: 35px;
    margin: 10px 0 0;
  }
}

// Dimension and spacing styles
.test {
  padding: rem(15);

  .use-px & {
    padding: 15px;
  }
}

.imagebox {
  width: rem(150);
  height: rem(150);
  margin-left: rem(50);
  margin-bottom: rem(20);

  .use-px & {
    width: 150px;
    height: 150px;
    margin-left: 50px;
    margin-bottom: 20px;
  }
}


//===========================================================================
// Styles without function for the font sizing, just to make things look nice
.container {
  position: relative;
  margin: 0 auto;
  padding: 0 rem(10);
  max-width: rem(1000);

  &--spaced {
    margin-top: rem(50);
    margin-bottom: rem(50);
  }

  &--centered {
    text-align: center;
  }
}

label {
  font-size: rem(9);
  text-transform: uppercase;
  font-weight: bold;
  color: #0078ff;
}

.test {
  background: #f5f5f5;

  &:after {
    content: "";
    clear: both;
    display: table;
  }
}

.imagebox {
  display: flex;
  justify-content: center;
  align-items: center;
  float: right;
  background: #ddd;
  color: #888;
}

hr {
  width: 100%;
  margin: 0;
  background: none;
  border: 0;
  border-bottom: 2px dashed #eee;
}

.help {
  display: block;
  transform: translateY(calc(100% - #{rem(3)}));
  font-size: rem(9);
  font-weight: bold;
  color: #999;
  line-height: 1;
}

              
            
!

JS

              
                
              
            
!
999px

Console