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HTML

            
              <header><h1>Site Title</h1>
  <button>Header Button</button>
  <button>Header Button</button>
  <nav>
    <a href="#">Header link</a>
    <a href="#">Header link</a>
    <a href="#">Header link</a>
  </nav>
</header>
<main>
  <p>Donec id elit non mi porta <a href="#">gravida</a> at eget metus. Fusce, fermentum massa amet. <a href="#">Etiam porta</a> sem malesuada magna mollis euismod. <a href="#">Donec</a> sed odio dui.</p>
  <button>Content Button</button>
  <button>Content Button</button>
</main>
            
          
!

CSS

            
              :root {
  --primaryColor: hsl(165, 60%, 40%);
}

a {
  color: var(--linkColor, var(--primaryColor));
}

button {  
  background: var(--Button-backgroundColor, var(--primaryColor));
  border: 1px solid var(--Button-borderColor, var(--primaryColor));
  border-radius: .5em;
  color: var(--Button-color, white);
  font-size: .9em;
  padding: .75em 2em;
  text-align: center;
}

header {
  --Button-backgroundColor: transparent;
  --Button-borderColor: currentColor;
  --Button-color: currentColor;
  --linkColor: currentColor;  
  background: #333;
  color: #fff;
}

/* The styles below aren't relevant to the demo. */

body {
  color: #333;
  font: 1em/1.25 'Helvetica Neue', sans-serif;
  text-align: center;
}

header,
main {
  padding: 2em;
}

h1 {
  font-size: 4em;
  font-weight: 400;
  margin: 0 0 .25em;
}

p {
  max-width: 36em;
  margin: 0 auto 1em;
}

button,
nav > a {
  display: inline-block;
  margin: .75em;
}
            
          
!

JS

            
              function supportsCSSCustomProperties() {
  var div = document.createElement('div');
  div.style.setProperty('--width', '1%');
  return div.style.getPropertyValue('--width') == '1%';
}

if (!supportsCSSCustomProperties()) {
  alert('Sorry! Your browser does not support CSS Custom Properties.');
}

            
          
!
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