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HTML

CSS

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HTML

              
                <div class="wrapper">
  <div class="pickers">
    <div id="primary" acp-color="#2f30d8" acp-palette="black|white"></div>
    <div class="app">
      <div class="app-hero">
        <div class="app-menu">
          <div class="menu-top"></div>
          <div class="menu-bottom"></div>
        </div>
        <div class="section-font">
    <div id="text-test" class="text-test"></div>

  </div>
      </div>
      <div class="result">
        <div class="result-top">
          <div>Level: <span id="level"></span></div>
          <div>ratio: <span id="ratio" style="color: green">21</span></div>          
        </div>
        <div class="result-center">brightness: <span id="brightness">Black </span>text is not legible</div>
      </div>
      <div class="footer">
    <div class="info-trigger">
    <i class="fas fa-info-circle"></i>
    <div class="info">Level AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text, and a contrast ratio of at least 3:1 for graphics and user interface components (such as form input borders). Level AAA requires a contrast ratio of at least 7:1 for normal text and 4.5:1 for large text.
<br><br>
Large text is defined as 14 point (typically 18.66px) and bold or larger, or 18 point (typically 24px) or larger.</div> 
  </div>
    <select id="select-font">
      <option value="18px">18px</option>
      <option value="24px">24px</option>
    </select>
        <p class="select-label">Change Font Size</p>
  </div>
    </div>
    <div id="font" acp-color="#fff" acp-palette="black|white"></div>
  </div>
</div>


              
            
!

CSS

              
                :root {
  --background-color: #2f30d8;
  --font-color: #fff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body, html {
  background: linear-gradient(#eee, #ddd);
  font-family: 'Montserrat', sans-serif;
  height: 100%;
}

.wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-evenly;
  position: relative;
  overflow: hidden;
  height: 100%;
  padding: 10px;
}

.section-font {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.text-test {
  margin-right: 10px;
  color: var(--font-color);
}

.result {
  font-size: 14px;
  text-transform: uppercase;
  font-weight: 600;
  padding: 20px;
}

.result-top {
  display: flex;
  justify-content: space-between;
}

.result-center {
  margin-top: 50px;
  text-align: center;
}

.pickers {
  display: flex;
  width: 100%;
  height: 90%;
  justify-content: space-evenly;
}

.a-color-picker {
  position: relative;
}

#primary .a-color-picker:before {
  position: absolute;
  content:'Background';
  bottom: 10px;
  right: 10px;
}

#font .a-color-picker:before {
  position: absolute;
  content:'Foreground';
  bottom: 10px;
  right: 10px;
}

.a-color-picker-palette-color {
  border: 1px solid #ccc;
}

.info-trigger {
  position: relative;
  cursor: pointer;
  margin-right: 20px;
}

.info {
  position: absolute;
  bottom: 110%;
  left: 0;
  width: 300px;
  padding: 20px;
  background-color: white;
  border-radius: 4px;
  border: 1px solid #ccc;
  color: black;
  display: none;
  z-index: 1000;
}

.info.active {
  display: block;
}


.app {
  background-color: #fff;
  height: 500px;
  width: 260px;
  border-radius: 20px;
  box-shadow: 0 0 3px #8e8e8e;
  position: relative;
}

.app-hero {
  height: 50%;
  width: 100%;
  background-color: var(--background-color);
  border-radius: 20px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 50px;
  display: flex;
}

.app-menu {
  position: absolute;
  width: 30px;
  height: 30px;
  margin: 20px;
}

.menu-top {
  width: 100%;
  height: 4px;
  background-color: var(--font-color);
  border-radius: 100px;
}

.menu-bottom {
  width: 70%;
  margin-top: 5px;
  height: 4px;
  background-color: var(--font-color);
  border-radius: 100px;
}

.footer {
  width: 100%;
  height: 50px;
  padding: 20px;
  position: absolute;
  bottom: 0;
  display: flex;
  justify-content: flex-start;
  align-items: center;
}

.select-label {
  padding-left: 10px;
  font-size: 10px;
}
              
            
!

JS

              
                var primary = document.getElementById('primary');
var font = document.getElementById('font');
var text = document.getElementById('text-test');
var select = document.getElementById('select-font');
var level = document.getElementById('level');
var infoTrigger = document.querySelector('.info-trigger');
var info = document.querySelector('.info');
var topMenu = document.querySelector('.menu-top');
var bottomMenu = document.querySelector('.menu-bottom');
var colorFont = '#fff';
var colorPrimary = '#2f30d8';
var fontSize = select.options[select.selectedIndex].value;
var resultRatio = 21;

// Set Defaults
level.textContent = "AAA";
level.style.color = 'green';
text.textContent = "Happy Bazinga!"

infoTrigger.addEventListener('mouseover', function(){
  if(!info.classList.contains('active')) {
    info.classList.add('active');
  }
});

infoTrigger.addEventListener('mouseleave', function(){
  if(info.classList.contains('active')) {
    info.classList.remove('active');
  }
});

select.addEventListener('input', function(){
  fontSize = select.options[select.selectedIndex].value;
  text.style.fontSize = fontSize;
  levelWCAG(resultRatio);
})

AColorPicker.from('#primary').on('change', (picker, color) => {
  var ratio = document.getElementById('ratio');
  var brightness = document.getElementById('brightness');
  colorPrimary = picker.rgbhex;
  document.documentElement.style.setProperty('--background-color', color);
  
  resultRatio = getContrast(colorPrimary, colorFont);
  var resultBrightness = getBrightness(colorPrimary);

  ratio.textContent = resultRatio;

  levelWCAG(resultRatio);
  
  if(resultBrightness < 125) {
       brightness.textContent = "Black ";
       topMenu.style.background = "#fff";
       bottomMenu.style.background = "#fff";
     } else {
       brightness.textContent = "White ";
       topMenu.style.background = "#000";
       bottomMenu.style.background = "#000";
     }
  return colorPrimary;
  return resultRatio;
});

AColorPicker.from('#font').on('change', (picker, color) => {
  var ratio = document.getElementById('ratio');
  colorFont = picker.rgbhex;

  resultRatio = getContrast(colorPrimary, colorFont);

  ratio.textContent = resultRatio;
  document.documentElement.style.setProperty('--font-color', color);

  levelWCAG(resultRatio);
  
  return colorFont;
  return resultRatio;
});

var getContrast = function(background, foreground) {

  // Convert hex to rgb
  // Credit to Denis http://stackoverflow.com/a/36253499/4939630
  var backgroundRGB = 'rgb(' + (background = background.replace('#', '')).match(new RegExp('(.{' + background.length/3 + '})', 'g')).map(function(l) { return parseInt(background.length%2 ? l+l : l, 16); }).join(',') + ')';

  var foregroundRGB = 'rgb(' + (foreground = foreground.replace('#', '')).match(new RegExp('(.{' + foreground.length/3 + '})', 'g')).map(function(l) { return parseInt(foreground.length%2 ? l+l : l, 16); }).join(',') + ')';

  // Get array of RGB values
  var backgroundRGBArray = backgroundRGB.replace(/[^\d,]/g, '').split(',');
  var foregroundRGBArray = foregroundRGB.replace(/[^\d,]/g, '').split(',');

  function luminance(r, g, b) {
      var a = [r, g, b].map(function (v) {
          v /= 255;
          return v <= 0.03928 ? v / 12.92 : Math.pow( (v + 0.055) / 1.055, 2.4 );
      });
      return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722;
  }

  function floor(number, decimals) {
    decimals = +decimals || 0;

    var multiplier = Math.pow(10, decimals);

    return Math.floor(number * multiplier) / multiplier;
}

  function contrast(el1, el2) {
    l1 = (luminance(el1[0], el1[1], el1[2]) + 0.05);
    l2 =(luminance(el2[0], el2[1], el2[2]) + 0.05);
    ratio = l1/l2;

    if (l2 > l1) {
      ratio = 1 / ratio;
    } 
    
    return floor(ratio, 2);
  }
  
  var contrast = contrast(backgroundRGBArray, foregroundRGBArray);
  return contrast;
}

var getBrightness = function(hex) {

    // Convert hex to rgb
    // Credit to Denis http://stackoverflow.com/a/36253499/4939630
    var rgb = 'rgb(' + (hex = hex.replace('#', '')).match(new RegExp('(.{' + hex.length/3 + '})', 'g')).map(function(l) { return parseInt(hex.length%2 ? l+l : l, 16); }).join(',') + ')';

    // Get array of RGB values
    rgb = rgb.replace(/[^\d,]/g, '').split(',');

    var r = rgb[0], g = rgb[1], b = rgb[2];

    var brightness = Math.floor((r * 299 + g * 587 + b * 114) / 1000);
    
    return brightness;
}

var levelWCAG = function(resultRatio){
   var ratio = document.getElementById('ratio');
   if(resultRatio >= 4.5 && fontSize === "18px" && resultRatio < 7) {
      ratio.style.color = 'green';
      level.textContent = "AA";
      text.textContent = "Bazinga!";
     } else if(resultRatio >= 3 && fontSize === "24px" && resultRatio < 4.5) {
      ratio.style.color = 'green';
      level.textContent = "AA";
      text.textContent = "Bazinga!";
     } else if(resultRatio >= 7 && fontSize === "18px") {
      ratio.style.color = 'green';
      level.textContent = "AAA";
      text.textContent = "Happy Bazinga!";
     } else if(resultRatio >= 4.5 && fontSize === "24px") {
      ratio.style.color = 'green';
      level.textContent = "AAA";
      text.textContent = "Happy Bazinga!";
     } else {
      ratio.style.color = 'red';
      level.textContent = "Nope";
      text.textContent = "Sad Bazinga...";
     }
  
     if(level.textContent !== "Nope") {
       level.style.color = 'green';
     } else {
       level.style.color = 'black';
     }
}
              
            
!
999px

Console